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

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

What do you see in the given picture?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

When we see 2 but call 10?

Before Mount Everest was discovered, what was the highest mountain in the world?