Find the next number in the series below

21 32 54 87 131 ?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

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

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

How can you make number one disappear by adding something to it?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Buy me, smell me or deliver me, I do not change.

Who am I?

Can you name an animal whose killing cannot be performed without spilling your own blood?