Prove that twice of ten is the same as twice of eleven.

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What does this rebus riddle means ?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

If six children and two dogs were under an umbrella, how come none of them got wet?

There was a strange boy who was born before his father. How can this be possible?

What has 13 hearts but no other organs?