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?

Can you write down eight eights so that they add up to one thousand?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

What is the fastest way to double your money?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Spot 5 differences in two Christmas tree below:

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?