The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

What always comes into a house through the keyhole?

What is the word or phrase?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?