A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Can you count the number of triangles in the given figure?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

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

Rearrange the letters in "new door" to make one word.

It is always ahead of me yet I can never see it. What is it?

I am the fastest animal but cannot climb the tree. What am I?