What four weights can be used to balance from 1 to 30 pounds?

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

Give it food and it will live; give it water and it will die.

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

If you say my name, I will no longer exist. What am I?

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

When 99 is considered higher than 100?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

Remove two matchsticks to make the below equation correct.