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?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

What is the next number in the series?

15 29 56 108 208 ?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

What is the word or phrase below?
R | E | A | D

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?