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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:

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:

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:

A man bumps into his mathematician friend on the street that he hasn't seen in 5 years. The man asks the mathematician how old his children are. The mathematician, who always replies in riddles said, "I now have three children. The sum of their ages is equal to the number of windows on the building in front of you and the product of their ages equals 36." The friend then says "I need one more piece of information." The mathematician then replies "My youngest child has blue eyes." What are the ages of the mathematicians three children?

Answer:

They are 6, 6, and 1.

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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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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:

Janie's friends were chipping in to buy her a wedding shower present. At first, 10 friends chipped in, but 2 of them dropped out. Each of the 8 had to chip in another dollar to bring the amount back up. How much money did they plan to collect?

Answer:

$40 (10 at $4, or 8 at $5).

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Riddle:

A nonstop train leaves Moscow for Leningrad at 60 mph. Another nonstop train leaves leningrad for Moscow at 40 mph. How far apartare the trains 1 hour before they pass eachother?

Answer:

100 miles (60+40)

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Riddle:

Tara has $29.00 dollars. She bought 4 coloring books that cost $3.00 each, 4 boxes of crayola crayons that cost $2.00 each. She spend the rest of her money on markers.

How much money did she spend on markers

Answer:

$9.00 on markers

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Riddle:

There is a creature which could double its size every day. So, if the creature is put in a tank then it will fill the tank in 10 days.

How many days would it take for the creature to fill 1/2 and 1/4 of the tank?

Answer:

9 days to fill 1/2 and 8 days to fill 1/4 of the tank.  If the creature fills the tank in 10 days and it doubles every day, on the ninth day it would fill 1/2 the tank. Thus on the 8th day it will fill 1/4 of tank.

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