Rectify the following equality 101 - 102 = 1 by moving just one digit.

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Move four matchsticks to the below square to form three squares?

Why do people go to bed?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Can you name some countries which do not have the alphabet 'A' in them?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?