How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What has 88 keys?

Solve the mathematical equation in the picture below.

Prove that twice of ten is the same as twice of eleven.

Why did the Girl throw the butter out of the window?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

In a secret society, a buried chamber can be accessed only via a secret password. The password is seven characters long and comprises of just letters and numbers.

You find a code that can help you in cracking the password. The code says "You force heaven to be empty".

Can you deduce the password from that?

There is a place where if I stand up straight, I will still be considered sideways.

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?