Find the next number in the series below

21 32 54 87 131 ?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

What does an Island and the letter T have in common?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

In the picture given below, can you find out which digit will take place of the question mark?

what does the below math rebus puzzle mean?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?