People make me, save me, change me, raise me. What am I?

Who has married many women but was never married?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

By using 'because' continuously three times, can you make an English statement ?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

How can you tell a raw egg from a hard-boiled egg?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

The more you take me, the more you leave me behind.
Who Am I?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?