What always comes into a house through the keyhole?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

How many times can you subtract the number two from the number fifty?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Which is heavier: a ton of bricks or a ton of feathers?

The centre of the third figure is empty. What digit should fit inside?

What do you see in the image below

What does below chemistry rebus means?

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