What is the next number in this series?

4,12,84,3612....

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

What two things can you never eat for breakfast?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

My location can be determined by the below rebus.
So where am i ?

What does the below rebus riddle means?

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?

John needs to purchase 100 chocolates from three different shops and he has exactly 100 rupees to do that which he must spend entirely. He must buy at least 1 Chocolate from each shop.

The first shop is selling each chocolate at 5 paise, the second is selling at 1 rupee and the third is selling at 5 rupees.

How many chocolates should he buy from each shop?