Why do we preferably have round manhole covers and not square ones?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

What is at the end of a rainbow?

Can you find out which options fits best with the missing column?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

Move three sticks of the spiral below to form a square.

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What has many keys but can’t open a single lock?