Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What is the word or phrase below?
R | E | A | D

During which month do people sleep the least?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

What is next number in the pattern below:

131 517 192 123 ?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

What's a single-digit number with no value?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?