It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

What does the below image rebus riddle means ?

How many letters are in the alphabet?

What is the difference between a jeweller and a jailer?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?