If two's company, and three's a crowd, then whats four and five ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What is black when you buy it, red when you use it, and gray when you throw it away?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What's a single-digit number with no value?

Decode the movie name from the below picture?

We know that money can be names differently for the purpose it is used for. Some of the examples of money given at following places or for following activities:

In temple = Daan
In school = Fees
During marriage = Dowry
For divorce = Alimony
Paying government = Tax
In court = Fine
Employer to employee = Salary
To kidnappers = Ransom
For illegal reason = Bribe
To civil servant retirees = Pension

Do you know what do we call the money a husband gives to his wife?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?