Find the next number in the series below

21 32 54 87 131 ?

What demands an answer, but asks no questions

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

It is always ahead of me yet I can never see it. What is it?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

What does below Rebus say?

XLR8

What does below Rebus mean ?

esgg sgeg gegs gsge