What is the next number in this series?

4,12,84,3612....

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

When it is alive we sing, when it is dead we clap our hands. What is it?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

In the picture given below, can you find out which digit will take place of the question mark?

What you cannot hold but it is yours?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.