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Riddle #543 (medium)

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Question: How many letters are in the answer to this riddle?

Answer: Four (this is the only number that makes the statement true).

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Question: There is a brick of gold and a brick of iron in a boat (both 10 inch blocks), if they are both dropped into the water which will make the water level higher?

Hint: Gold weights more than iron.

Answer: The iron block.

The iron will make the water level higher because both blocks will actually make the water level drop most likely. In the boat they have a larger effect on the water level (raise the water level) and then when they are dropped into the water the lighter one (iron), will make the water level drop less because it is lighter and has less effect on the water from the boat but displaces the same amount of water as the gold when dropped into the water.

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Riddle #646 (medium)

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By rmezher

Question: A father goes to prison and the mother will have to sell her hotel, but their young daughter is happy.

How can these parents tolerate such ingratitude and what put them in this situation?

Answer: The three of them are playing Monopoly

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Question: Anna can drive a Toyota, but not a Prius.
She can marry Otto, but not Peter.
She can borrow or rob, but not share and steal.

Can Anna pull up if I pull up?

Answer: Yes she can. Anna can do anything that is a palindrome. Anything that is the same backwards and forwards.

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3 coins (medium)

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Question: You have three coins. One always comes up heads, one always comes up tails, and one is just a regular coin (has equal change of heads or tails). If you pick one of the coins randomly and flip it twice and get heads twice, what is the chance of flipping heads again?

Answer: 90 percent. If you pick the heads coin the chance of getting the first 2 heads is 100 percent (4/4) and if you pick the fair coin the chance is 25 percent (1/4). So from this, the chance that it is the heads coin is 4/5 and the fair coin 1/5.

Then, if it is the heads coin you will definitely get heads (4/5). If you flip the fair coin it is 1/10 (1/5 * 1/2). Add the probabilities together: 4/5 + 1/10 = 9/10.

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