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A riddle problem is a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer or meaning, typically presented as a game.  Below is a list of the past problem of the week riddles in descending chronological order.

Riddle:

How many times can you subtract the number 5 from 25?

Answer:

Once, because after you subtract it's not 25 anymore.

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Riddle:

What number is that, which, added separately to 100 and 164, shall make them perfect squares?

Answer:

125.

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Riddle:

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Answer:

33. The pattern:  Double the previous number and subtract 1.

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Riddle:

An item is made from lead blanks in a lathe shop. Each blank suffices for 1 item. Lead shavings accumulated for making 6 items can be melted and made into a blank. How many items can be made from 36 blanks?

Answer:

From 36 blanks there are 36 items made. The lead shavings are enough to make 6 blanks. Which make 6 more items. But don't stop here. The new shavings are good for 1 more item. Total: 43.

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Riddle:

A man told his son that he would give him \$1000 if he could accomplish the following task. The father gave his son ten envelopes and a thousand dollars, all in one dollar bills. He told his son, "Place the money in the envelopes in such a manner that no matter what number of dollars I ask for, you can give me one or more of the envelopes, containing the exact amount I asked for without having to open any of the envelopes. If you can do this, you will keep the \$1000." When the father asked for a sum of money, the son was able to give him envelopes containing the exact amount of money asked for. How did the son distribute the money among the ten envelopes?

Answer:

The contents or the ten envelopes (in dollar bills) should be as follows: \$1, 2, 4, 8, 16, 32, 64, 128, 256, 489. The first nine numbers are in geometrical progression, and their sum, deducted from 1,000, gives the contents of the tenth envelope.

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Riddle:

Can you write down eight eights so that they add up to one thousand?

Answer:

888 + 88 + 8 + 8 + 8 = 1000.

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Riddle:

One is to three as three is to five and five is to four and four is the magic number.

What is the pattern?

Answer:

One has three letters in the word three has five letters in it five has four letters and four has four letters in it (if you try more numbers they will always come back to the number four: so four is the magic number)

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Riddle:

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Answer:

The difference in age is 23 years, so I must be 23 if my father is twice as old as me.

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Riddle:

Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6.  What are the two numbers?

Answer:

2 and 2.

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Riddle:

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Answer:

Nine Years.

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