What is the fastest way to double your money?

Find out the missing number in the picture attached:

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

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?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

There are forty elephants and they have forty-fore heads. How can this be possible?

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

A bomb exploded in a room full of married couples and no one died. How?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.