If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

In a family supper, a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one daughter-in-law, and one mother-in-law need to sit at a table.

There are only seven chairs available at the place. How many more chairs do they have to borrow so that everyone can sit down together for the suppers if everybody requires a separate chair?

I am white when I am dirty, and black when I am clean. What am I?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

Can you tell a 3D object that has just two surfaces?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

Find the last number in the series below:

voN luJ yaM raM ---

I can write cow in 13 letters.

Can You?