Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

What is common among 11, 69, and 88?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

Replace the question mark with the correct number.

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Find the missing number in the sequence below:

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