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What can go up a chimney down, but can’t go down a chimney up?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Find the value of "?" in the ball picture Riddle below:

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

I have teeth but i don't bite. Who Am I ?

Why 1729 is a magic number? Answer Logically.

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.