I look at you, you look at me I raise my right, you raise your left. What am I?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

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.

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

What does this rebus mean?

O
N
C
E
TIME

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

What can you see in the middle of March and April that you can never see in any other month?

What word is represented by this rebus?

How can you tell a raw egg from a hard-boiled egg?

If eleven plus two equals one, what does nine plus five equal?