Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

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 Rajina's daughter is my daughter's mom, who am I to Rajina?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?