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

Replace the question mark with the number below given a simple math problem.

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag. Randomly remove two balls from the bag. * If they are of different colors, put the blue one back in the bag. * If they are the same colour, take them out and put a red ball back in the bag. Repeat this until only one ball remains in the bag. What is the color of the sole ball left in the bag ?

Solve the equation in the image by looking at the pattern closely.

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Who is that with a neck and no head, two arms and no hands? What is it?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C