Prove that twice of ten is the same as twice of eleven.

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

How many triangles are there on the puzzle below?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What is full of holes but still holds water?