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?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

What kind of tree can you carry in your hand?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?