What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Which point will the car reach to go out?

What does this rebus mean?

O
N
C
E
TIME

What will you call your mother's brother's brother-in-law?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

Find the missing number in the image below.

Decode this picture on T-Shirt and tell what it says ?

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.

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?