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Riddle:

The head of a whale is six feet long; his tail is as long as his head and half his body, and his body is half of his whole length. How long is the whale?

Answer:

Forty-eight feet.

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Riddle:

Take eight small sticks, four of which are half the length of the other four. Make three equal squares out of the sticks.

Answer:

Use the longer four sticks to be sharing sides between the squares and at the end their should be three intertwined squares.

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Riddle:

Taking that internship in a remote mountain lab might not have been the best idea. Pulling that lever with the skull symbol just to see what it did probably wasn’t so smart either. But now is not the time for regrets because you need to get away from these mutant zombies...fast. Can you use math to get you and your friends over the bridge before the zombies arrive? Alex Gendler shows how.

Answer:

At first it might seem like no matter what you do, you're just a minute or two short of time, but there is a way.  The key is to minimize the time wasted by the two slowest people by having them cross together.  And because you'll need to make a couple of return trips with the lantern, you'll want to have the fastest people available to do so.  So, you and the lab assistant quickly run across with the lantern, though you have to slow down a bit to match her pace.  After two minutes, both of you are across, and you, as the quickest, run back with the lantern.  Only three minutes have passed.  So far, so good.  Now comes the hard part.  The professor and the janitor take the lantern and cross together.  This takes them ten minutes since the janitor has to slow down for the old professor who keeps muttering that he probably shouldn't have given the zombies night vision.  By the time they're across, there are only four minutes left, and you're still stuck on the wrong side of the bridge.  But remember, the lab assistant has been waiting on the other side, and she's the second fastest of the group.  So she grabs the lantern from the professor and runs back across to you.  Now with only two minutes left, the two of you make the final crossing.  As you step on the far side of the gorge, you cut the ropes and collapse the bridge behind you, just in the nick of time.

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Riddle:

Adored by few, Feared and hated by many. Mistress of the entire universal reason, Master in the art of numbers. Some may have solved many of your mysteries, But there still much of them to find. What are they?

Answer:

Mathematics.

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Riddle:

There is a certain club which is for men only. There are 600 men who belong to this club and 5% of these men wear one earring. Of the other 95% membership, half wear two earrings and the other half wear none. How many earrings are being worn in this club?

Answer:

Six hundred. We know that 5%, or 30 of the men are wearing one earring. Of the other 95%, or 570, we know that half are wearing two earrings and the other half none. This is the same as if they all wore one.

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Riddle:

In a pond there are some flowers with some bees hovering over them. How many flowers and bees are there if both the following statements are true: 1. If each bee lands on a flower, one bee doesn't get a flower. 2. If two bees share each flower, there is one flower left out.

Answer:

4 bees and 3 flowers.

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Riddle:

Two schoolgirls were traveling from the city to a dacha (summer cottage) on an electric train.

"I notice," one of the girls said "that the dacha trains coming in the opposite direction pass us every 5 minutes. What do you think-how many dacha trains arrive in the city in an hour, given equal speeds in both directions?"

"Twelve, of course," the other girl answered, "because 60 divided by 5 equals 12."

The first girl did not agree. What do you think?

Answer:

If the girls had been on a standing train, the first girl's calculations would have been correct, but their train was moving. It took 5 minutes to meet a second train, but then it took the second train 5 more minutes to reach where the girls met the first train. So the time between trains is 10 minutes, not 5, and only 6 trains per hour arrive in the city.

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Riddle:

There are two numbers whose product added to the sum of their squares is 109, and the difference of whose squares is 24. What are the two numbers?

Answer:

5 and 7.

(5)² = 25
(7)² = 49
(5x7)+25+49=109
49-25=24

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Riddle:

Robert and David played several golf matches against each other in a week. They played for a pizza at each match, but no pizzas were purchased until the end of the week. If at any time Robert and David had the same number of wins, those pizzas were canceled. Robert won four matches (but no pizzas), and David won three pizzas. How many rounds of golf were played?

Answer:

Eleven, David won 7 matches, 4 to cancel out Robert's 4 wins, and 3 more to win the pizzas.

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Riddle:

Three matches are sitting on a table. Without adding another make for three matches four. You are not allowed to break any of the matches.

Answer:

Shape the 3 matches into a romanumeral four.

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