I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Take away the whole and some still remain. What is it?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

Count the number of lines in the image below ?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What does this rebus means ?

PROG WORKRESS

Why is 6 afraid of 7?

If 1+9+8=1, what is 2+8+9?