Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Can you count the number of squares in the given picture?

What has hands, but can’t clap?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?