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

What goes up but never comes down?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

What is the Surname of Barbie Doll?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Can you count the number of children in the picture below

How is a fly different from a mosquito?

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Complete the missing letters of the given word.