How many sides does a circle have?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What does below chemistry rebus means?

What's the only room from which no one can enter or leave

A farmer went to a market and bought a wolf, a goat, and a cabbage. On his way home, the farmer came to the bank of a river and rented a boat. But crossing the river by boat, the farmer could carry only himself and a single one of his purchases: the wolf, the goat, or the cabbage. If left unattended together, the wolf would eat the goat, or the goat would eat the cabbage. The farmer’s challenge was to carry himself and his purchases to the far bank of the river, leaving each purchase intact. How did he do it?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

What is so fragile that saying its name breaks it?

What does this simple rebus mean?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?