Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

What is the centre of gravity?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

I have branches, but no fruit, trunk or leaves. What am I?

Why is 6 afraid of 7?

What number when divided in half becomes zero?