Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

What came first, the chicken or the egg?

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

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Replace the question mark in the picture below.