There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

How many triangles are there on the puzzle below?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Name a key which is hardest to turn.

What 5-letter word typed in all capital letters can be read the same upside down?

Find the next number in the series below.

6 18 270 72090 ?