What is the next number in this series?

4,12,84,3612....

what does the below rebus means?

What can you see in the middle of March and April that you can never see in any other month?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

How do you go from 98 to 720 using just one letter?