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

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

what does this below rebus represent identXQQQQQME

What is the next number in this series?

4,12,84,3612....

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Can you name an animal whose killing cannot be performed without spilling your own blood?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

How many bananas can you eat if your stomach is empty?

What breaks yet never falls, and what falls yet never breaks?