When is the top of a mountain similar to a savings account?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

How many words can a pen with half refill write?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

What demands an answer, but asks no questions

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes