Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I don't get anymore wetter, no matter how much rain falls on me.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What word is represented by this rebus?