A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

There are forty elephants and they have forty-fore heads. How can this be possible?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Find the next number in the series

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

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?