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 ?

Can you solve below mathematical equation?

2^1234 - 2^1233

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

Replace the question mark with the correct number in the below-given picture?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

If eleven plus two equals one, what does nine plus five equal?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?