What does this rebus riddle means ?

10+10 and 11+11 can give you the same answer.

Explain how?

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

There was a strange boy who was born before his father. How can this be possible?

What month of the year has 28 days?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

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?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?