What does this rebus mean?

O
N
C
E
TIME

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

I am an odd number. Take away a letter and I become even. What number am I?

Which word does the below Plexor means ?

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

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

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

No one wants to have it, but if one got it, he does not want to lose it. What is It?