Riddles and Brain Teasers - Hopping Up Your Brain

How Many Letters In the Alphabet

How many letters are there in the alphabet?

Hint: Not 26

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11. The phrase “the alphabet” has 11 letters.

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The Longest Pregnancy

A baby was born four years after its parents died in a car crash. How was this possible?

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Amazingly, this actually happened. The parents died in a crash crash and their parents fought for the rights to the four frozen embryos left by their late children. After a surrogate pregnancy, the baby was born with DNA matching their deceased parents.

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The Long River

How many times does the letter S appear in the name of the longest river in the world?

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Zero. The Nile is the longest river in the world. Some claim the Amazon as the longest, but that too has no “S”es (that looks weird but I don’t know how else to write the plural of “s”). The Mississippi is the 4th largest river in the world according to a href=”https://en.wikipedia.org/wiki/List_of_rivers_by_length”>Wikipedia.

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Weighty Wine

How much does a bottle of wine weigh if it is 1 kilogram plus half its own weight?

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2 kg.If we let half of the bottle’s weight be “n”, then we get the following equation: n/2 + 1kg = n (the bottle’s weight).Solve for n:
n/2 + 1 = n
1 = n/2
2 = n

2 kg.

If we let half of the bottle’s weight be “n”, then we get the following equation: n/2 + 1kg = n (the bottle’s weight).

Solve for n:
n/2 + 1 = n
1 = n/2
2 = n

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Alternating Empties

Six glasses are all in a row in front of you, the first three are full of grape juice and the last three are empty. Moving only one glass, how can you make all six alternate between full and empty?

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Pour the contents of the second glass into the fifth glass.

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Quick Mental Math

Solve this math problem in your head. Divide 30 by a half, then add 10.

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70. It’s not 25 because dividing by a half is the same as multiplying by 2.

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The Mysterious 6th Floor Window

A man was looking through a window on the 6th floor, opened it, thought for a minute then jumped, passing through the open window, but he was not injured. How was this possible?

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He was a window washer and he was entering the building.

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Two Days of the Week Starting With T

What two days of the week start with ‘T’, other than Tuesday and Thursday?

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Today and tomorrow.

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Hard Boiled Kiwi Bird Eggs

If you can hard boil a Kiwi bird egg in 20 minutes, how long would it take to hard boil four Kiwi bird eggs?
Note: Kiwi birds are about the size of a chicken, but they lay eggs that are close to the size of an Ostrich egg. So one would assume they must take a long time to hard boil.

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20 minutes. You can boil them all at once in a large pot.

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