What do you answer even though it never asks you questions?

What is the fastest way to double your money?

Which word does the below Plexor means ?

How is a fly different from a mosquito?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Using Only Five 5's and any mathematical operator make sum as 37

Can you find out which options fits best with the missing column?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

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 ?