Radio Astronomy Systems Research Group wiki:donuts

wiki:donuts:3-man-duel

Anonymous (anonymous@undisclosed.example.com) — 2013-09-25T12:54:55-0600

Answer: He should shoot up in the air.

wiki:donuts:3lights

Anonymous (anonymous@undisclosed.example.com) — 2013-12-17T13:22:16-0600

Answer Flip one switch on. Leave it there for a few minutes. Turn it off, then turn on a different switch and head into the room. Touch the two lights that are not on. The warm one will be the first switch that you left on for a while, the light that is on goes with the switch you just flipped on, and the last goes with the one you didn't ever turn on.

wiki:donuts:3sons

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:53:31-0600

Answer: The sons are 2, 2 and 9. Solution Clue 1: The product of there ages is 36. The friend is very clever, so he comes up with all the following possibilities: 1 x 1 x 36 1 x 2 x 18 1 x 3 x 12 1 x 4 x 9 1 x 6 x 6 2 x 2 x 9 2 x 3 x 6 3 x 3 x 4

wiki:donuts:6daytrip

Anonymous (anonymous@undisclosed.example.com) — 2013-09-25T12:58:03-0600

Answer: The man brings a couple of buddies with him. The first day, they eat out of one mans pack (3 rations). The next morning, that buddy leaves with his remaining ration and heads home. The other two continue on, eating 2 more rations. The next morning, the other buddy leaves with his remaining 2 rations and makes the 2 day trek back home. The man then continues to grandma's with his own 4 rations, which will last the the 4 days left in his trip.

wiki:donuts:alphabetical

Anonymous (anonymous@undisclosed.example.com) — 2013-12-10T17:47:53-0600

Answer 40 (forty)

wiki:donuts:bedouins

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:07:25-0600

Answer: The trick to this question is to figure out just how much bread each person ate compared to how much they contributed. There were 8 loaves total split among the 3 of them. Thus, each ate 8/3 loaves. Bedouin #1 had 5 loaves, or 15/3. Bedouin #2 had 3 loaves, or 9/3.

wiki:donuts:bridge

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:33:02-0600

Answer: The shortest amount of time is 17 minutes. For simplicity, we'll refer to each person by the time it takes to cross. * 1 and 2 cross * 1 comes back with the flashlight * 5 and 10 cross * 2 comes back with the light * 1 and 2 cross

wiki:donuts:candeles

Anonymous (anonymous@undisclosed.example.com) — 2014-01-08T16:00:27-0600

Answer 2 Hours. One will have burned 1/3 of the way, and the other 2/3.

wiki:donuts:chinesecollege

Anonymous (anonymous@undisclosed.example.com) — 2013-08-30T09:45:51-0600

120

wiki:donuts:cube

Anonymous (anonymous@undisclosed.example.com) — 2013-10-23T16:53:15-0600

Answer There will be 44 cubes with black paint on two or more surfaces. Only the edges have paint on 2 or more surfaces. There are 12 edges which each have 5 cubes. If you take 12*5, you will count each corner 3 times, so subtract the repeats. #edges * #CubesPerEdge - 2* #corners = 12*5 - 2*8 = 60-16 = 44

wiki:donuts:diff

Anonymous (anonymous@undisclosed.example.com) — 2013-10-16T16:57:46-0600

Answer Each of the 8 legs

wiki:donuts:digits

Anonymous (anonymous@undisclosed.example.com) — 2013-06-27T14:01:05-0600

Answer: There are two ways of solving this. For a pretty thorough explanation of the first check out this video: Here is a brief explanation of both. Method 1 Similar to the Gauss question, add up the digits in each pair of numbers. 0 1 2 3 ... 999996 999997 999998 999999 1000000 ^ ^ 0 1 2 3 ... 999996 999997 999998 999999 1000000 ^ ^ 0 1 2 3 ... 999996 999997 999998 999999 1000000 …

wiki:donuts:doubledigits

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:33:52-0600

Answer: 41312432

wiki:donuts:drawing

Anonymous (anonymous@undisclosed.example.com) — 2013-06-25T13:33:53-0600

Answer: There are many solutions. Here is just one.

wiki:donuts:fall2013

Anonymous (anonymous@undisclosed.example.com) — 2014-04-30T11:18:53-0600

Pair-wise Sums Choose five number that, when added in pairs, will sum to each of the values 0 1 2 4 7 8 9 10 11 12. answer 6 Day Trip A man must visit his grandma. It will take him six days to make the trip. A person can only carry four days worth of food. How will he survive?

wiki:donuts:fall2014

Anonymous (anonymous@undisclosed.example.com) — 2014-12-17T14:56:34-0600

Connect the Dots Can you connect all of the dots in the grid below following these rules: 1. You have to connect all the dots with a continuous line (no pencil lifts) 2. You can't cross a line or use diagonals 3. The underscore is a space that you cannot go through

wiki:donuts:fall2015

Anonymous (anonymous@undisclosed.example.com) — 2016-01-13T11:05:54-0600

Balls Place 10 balls in 5 lines in such a way that each line has exactly 4 balls on it. answer House Numbers In a neighborhood, each person needs to have a house number (in words) at their doors. At the store where the letters are bought, each letter is a different cost. Mike, who lives in the neighborhood, goes to buy letters for his house number and finds three of his neighbors in line to get theirs. The first neighbor's house number is

wiki:donuts:fall2016

Anonymous (anonymous@undisclosed.example.com) — 2016-11-09T15:32:27-0600

Perimeters Find the perimeter of both figures: answer Switching sides O O O _ X X X Put all the O's on the left side and all the X's on the right side. Only move one at a time and each character can only move forward. answer 3 ton trucks A person is moving and their stuff weighs 10 tons. The trucks being used to move can carry a max weight of 3 tons. Each of the boxes being used can hold a max weight of 1 ton. How many trucks should the person use to move

wiki:donuts:fix_the_equation

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T13:57:08-0600

Answer: Change the 62 so that you have 26 62 - 63 = 1 ---> 26 - 63 = 1

wiki:donuts:foxrabbit

Anonymous (anonymous@undisclosed.example.com) — 2014-01-09T07:38:36-0600

Answer 25/36

wiki:donuts:hats

Anonymous (anonymous@undisclosed.example.com) — 2014-02-13T13:41:18-0600

Answer Bill is wearing a Black hat. To find the solution, you must go through all possibilities. Tom's options are B/W/W, ?/B/B, ?/B/W, or ?/W/B: (Black, White or ? (unknown)) B W W Tom Bob Bill -- Tom sees white hats and knows he has a black hat

wiki:donuts:holeypaper

Anonymous (anonymous@undisclosed.example.com) — 2013-07-17T16:16:55-0600

Answer: There is more than one answer. Two are shown here. Solution 1: Cut a hole out of the center and use that to fill the other hole. Solution 2: Cut a strip off the corner and put it on the opposite corner.

wiki:donuts:hourglasses

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:02:56-0600

Answer: There are multiple answers. Presented here is only one possible solution. Start both hourglasses. When the 4 minute one runs out, there will be 3 minutes left on the other. Flip the 4 to restart it. When the 7 minute glass runs out, there will be 1 minute left on the 4 minute hourglass. (At this point, 7 minutes have passed.) Flip the 7 minute glass over. When the 4 minute glass empties, there will be 1 minute of sand in the 7 minute glass. (Now 8 minutes have passed.) Flip the 7 over …

wiki:donuts:lettera

Anonymous (anonymous@undisclosed.example.com) — 2013-07-26T21:42:58-0600

Answer: Just start counting!

wiki:donuts:pair-wise-sums

Anonymous (anonymous@undisclosed.example.com) — 2013-09-25T12:53:09-0600

Answer: The numbers are: 3, -3, 4, 5, and 7

wiki:donuts:riddle

Anonymous (anonymous@undisclosed.example.com) — 2013-12-10T17:48:32-0600

Answer A keyboard.

wiki:donuts:righthand

Anonymous (anonymous@undisclosed.example.com) — 2013-09-26T22:07:33-0600

Answer: Your right elbow.

wiki:donuts:rotatingdates

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:34:11-0600

Answer: 1961

wiki:donuts:semiprime

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:08:05-0600

Answer: 17 x 23 = 391

wiki:donuts:sequence

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:37:25-0600

Answer: What are the next two letters in this sequence? W A T N T L I T S

wiki:donuts:sharethedonut

Anonymous (anonymous@undisclosed.example.com) — 2013-12-17T13:33:34-0600

Answer

wiki:donuts:spring2016

Anonymous (anonymous@undisclosed.example.com) — 2016-06-15T14:57:46-0600

1000 bottles You are the ruler of a kingdom and you throw a huge party. You are poisoned when you drink from one of the bottles in the party. There are 1000 bottles for you to choose from and you have 24 hours before you die. You get prisoners to try each one of the bottles to see which one had the poison. If the poison can kill any prisoner in 10 to 20 hours, what is the minimum number of prisoners that you can use?

wiki:donuts:springsummer015

Anonymous (anonymous@undisclosed.example.com) — 2015-06-02T12:25:34-0600

Cards on a table You have 8 cards: two Aces, two Kings, two Queens, and two Jacks. You need to place then on a table in the following arrangement: X X X X X X X X In addition, you need to follow these five rules: 1: Each Ace must be adjacent to a King

wiki:donuts:springsummer2013

Anonymous (anonymous@undisclosed.example.com) — 2014-04-30T11:25:43-0600

The Bridge Crossing One night, there were 4 people that came across a bridge they must cross. Because the bridge was very old an full of holes, it was impossible to cross in the dark. Luckily, there was a single flashlight which they must carry with them as the cross the bridge. The bridge also had a weight limit and would collapse if more than two of the people tried to cross at the same time.

wiki:donuts:springsummer2014

Anonymous (anonymous@undisclosed.example.com) — 2014-08-27T16:16:11-0600

Muddy Tracks The image below shows tracks left by a bicycle riding on a muddy trail. Which direction was the bike traveling: left to right, or right to left? answer Bookworm On a bookshelf is a two volume set. A bookwork eats his way through from the first page of Vol. 1 to the last page of Vol. 2. If each volume has 1cm of pages and each cover is 2mm thick, how far did the bookwork eat through?

wiki:donuts:sticks

Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T14:12:04-0600

Answer: Move one of the sticks in the first plus sign and put it in front of the first stick Take this stick: | + || + ||| + |||| ^ and put it here: -| - || + ||| + |||| ^ Now you have -1 - 2 + 3 + 4 = 4

wiki:donuts:summer2016

Anonymous (anonymous@undisclosed.example.com) — 2016-07-14T10:20:01-0600

Crane A crane with a 200 ft long boon and a 50 ft long rear boon has a lifting capacity of 10000 pounds. What amount of weight should it have on the rear boon? (Hint: Think of the minmax) answer Pyramid You are a secret agent trying to stop a villain from enacting his evil plan to destroy the world. You are given some in.tel that there is a kill switch in a room located in a pyramid with 10 floors numbered 1 through 10 from top to bottom (top being 1 and 10 being bottom). You receive some ad…

wiki:donuts:timepiece

Anonymous (anonymous@undisclosed.example.com) — 2013-07-03T16:20:27-0600

Answer: An hourglass.

wiki:donuts:toothpicks

Anonymous (anonymous@undisclosed.example.com) — 2013-11-08T21:08:52-0600

Answer _|_|_ _ _ _|_|_ ---> |_|_|_| | | |_|

wiki:donuts:trainsfly

Anonymous (anonymous@undisclosed.example.com) — 2014-02-12T17:06:15-0600

Answer 150 km

wiki:donuts:twentyfour

Anonymous (anonymous@undisclosed.example.com) — 2013-06-26T22:54:58-0600

Answer: There is more than one solution. Here is one possibility: 8 / (3 - 8/3) 8 / (3 - 8/3) = 8 / (9/3 - 8/3) = 8 / (1/3) = 8 * 3 = 24

wiki:donuts:whatisit

Anonymous (anonymous@undisclosed.example.com) — 2013-10-16T16:58:20-0600

Answer A coffin.

wiki:donuts:wheel

Anonymous (anonymous@undisclosed.example.com) — 2013-11-08T21:16:19-0600

Answer b) and d) are correct

wiki:donuts:win14sequence

Anonymous (anonymous@undisclosed.example.com) — 2014-02-20T12:14:31-0600

Answer x = 72 Each number in the sequence is flanked by prime numbers 3 4 5 5 6 7 11 12 13 17 18 19 29 30 31 41 42 43 59 60 61 71 x 73 101 102 103

wiki:donuts:winter2013

Anonymous (anonymous@undisclosed.example.com) — 2014-04-30T12:12:28-0600

Fix the Equation By moving only a single digit or sign, make the following equation valid. 62 - 63 = 1 Answer Hourglasses There is a chef famous for his 9 minute boiled egg. Sadly, his 9 minute hourglass broke one morning. He looks around the kitchen and finds two hourglasses: one has 4 minutes worth of sand in it, the other has 7. Is there a way for the chef to measure 9 minutes using these two hourglasses?

wiki:donuts:winter2014

Anonymous (anonymous@undisclosed.example.com) — 2014-04-30T11:15:57-0600

The Fox and the Rabbit In the forest, there is a meadow. A fox and a rabbit each take 10 seconds to cross this meadow. One day, they both cross this meadow. Their arrival time is uniformly distributed from 4:00 to 4:01 pm. If the fox and the rabbit happen to be in the meadow at the same time, the fox will eat the rabbit. What is the probability that the rabbit survives?

wiki:donuts:winter2015

Anonymous (anonymous@undisclosed.example.com) — 2015-04-15T14:22:29-0600

Lockers You come upon a row of 100 closed lockers. Starting with locker number 1, you open every locker. Then you go back and open every 2nd locker. Then you go back and visit every 3rd locker: if it is open you close it, if it is closed you open it. You continue this process toggling every n

wiki:donuts:winter2016

Anonymous (anonymous@undisclosed.example.com) — 2016-04-20T14:27:31-0600

Mobile Digits Puzzle You have a mobile with a keyboard which consists of 10 digits and two symbols, [#] and [*], as shown in the illustration. On the mobile's screen is a small program which shows the same keyboard, but with the buttons in a different order. When you press a button on the keyboard, then the respective button on the same place on the screen is highlighted. That is: button [1] on the keyboard highlights button [6] on the screen; button [2] on the keyboard highlights button [7…

wiki:donuts:winter2017

Anonymous (anonymous@undisclosed.example.com) — 2017-04-17T13:28:45-0600

Missing money I borrowed $50 from mum and $50 from dad to buy a bag costing $97. After the purchase, I had $3 left. I returned $1 to dad and $1 to mum, and reserved $1 for myself. I now owe $49+$49=$98 plus the $1 I reserved for myself, which is $99. Where is the missing $1?

wiki:donuts:winter2018

Anonymous (anonymous@undisclosed.example.com) — 2018-01-18T10:17:59-0600

Black & white socks A blind man goes to a store and buys 3 pairs of black socks and 3 pairs of white socks. Each pair is tied in a rubber band. The man happens to bump into another blind man on his way out. This other blind man is returning the 3 pairs of black socks and 3 pairs of white socks that are identical to the previously mentioned pairs. When they bump into each other, they dropped their socks. How do they both assuredly get 3 pairs of black socks and 3 pairs of white socks without get…