What begins with T, ends with T, and has T in it?

Find the next number in the series below

21 32 54 87 131 ?

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

You see me once in June, twice in November, and not at all in May. What am I?

What has many teeth, but cannot bite?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

When we see 2 but call 10?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?