Find the next number in the series below

21 32 54 87 131 ?

Can you count the number of lines in the below picture?

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

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Why is the Hole below a Lock?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!