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

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

When 99 is considered higher than 100?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Find the value of "?" in the ball picture Riddle below:

The more of this there is, the less you see. What is it?