If it took eight men ten hours to build a wall, how long would it take four men to build it?

Which alphabet letter is a question?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

Which famous Hollywood movie name is hidden in the below rebus?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

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?

Find the value of "a" by solving the maths equation in the picture below:

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?