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Riddle:

The distance from the Earth to the Sun is about 100 million miles. The speed of light is 186,000 miles per second, and light takes eight minutes to reach the Earth from the Sun.  Let's say the Sun rose at 6am this morning, and that by some freak of physics the speed of light is suddenly doubled to 372,000 miles a second.

What time will the Sun rise tomorrow?

Answer:

6am again. After all, what diffrence does the speed of light make to the answer?  It's irrelevant- only the speed of the roation of the Earth matters here.  

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Riddle:

What is the next number in the series?

7,645 5,764 4,576...

Answer:

6,457. The last digit is moved to the front to make the next number.

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Riddle:

If someone says to you, "I'll bet you $1 that if you give me $2, I will give you $3 in return", would this be a good bet for you to accept?

Answer:

No. This is a situation where you lose even if you win. Assuming the other person is being wise, they would take your $2 and say, "I lose", and give you $1 in return. You win the bet, but you're out $1.

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Riddle:

If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?

 

Answer:

Twenty one. Most people would think there were 42 handshakes. The first person shakes the hand of 6 others, the second person shakes the hand of 5 remaining people, the third person shakes the hand of 4 remaining people, the fourth person shakes the hand of 3 remaining people, the 5th person shakes the hand of 2 remaining people and the sixth person shakes the hand of 1 remaining person. 6+5+4+3+2+1=21

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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:

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:

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:

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:

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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