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

Our product and our sum always give the same answer. Who are we?

Can you replace the question mark with the correct number in the below table sequence?

What can you serve, but never eat?

Find out the number of circles in the given picture having Illusion

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

Find the missing number in the image below.

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?