What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

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

How Come ??

I have eight fingers and two thumbs but I do not live. What Am I?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

A sundial has the fewest moving parts of any timepiece. Which has the most?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

If 1+9+8=1, what is 2+8+9?

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?

what's the probability of getting a king or a queen from a pack of 52 cards?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?