Can you find a number that lies one third of the distance between 1/3 and 2/3?

Find the next number in the series below

21 32 54 87 131 ?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

Find the next number in the sequence

5 12 24 36 ?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Do you know who was buried in John's tomb?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.