If 21x = 79x, what is the value of x?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

I travel all around the world but always stay in the corner. What am I?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?