Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

How can a man go eight days without sleep?

Why 1729 is a magic number? Answer Logically.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Why is the longest human nose just 11 inches?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

In the four images below, can you find the odd one out?

What number divided by 4 is the same as that number minus 4?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.