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

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

What does this below rebus puzzle mean?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

John was piloting a plane behind a car but was never able to overtake it. Why?

Solve the following series:
AZ, GT, MN, __, YB

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

Why is a river so rich ?

We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
1 1 1 = 6
2 + 2 + 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?