Can you fill the blank with the correct number?

6 30 870 756030 _____

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

I am the fastest animal but cannot climb the tree. What am I?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

What demands an answer, but asks no questions

Can you decipher the below rebus?

PBLUESAISNUERSES

There are two arch enemies Messi and Ronaldo who hate each other to an extreme. One day both were going together and a Jeanie appeared in front of them. Jeanie grants 3 wishes to Ronaldo and one to Messi.

Messi replied smartly 'Give me twice whatever Ronaldo demands'.

Ronaldo asked his 1st wish 'Give me 10000 billion dollars. Soon Messi gets 2000 billion dollars.
Ronaldo asked for his 2nd wish 'Give me one mansion in every country in the world. Soon Messi gets two mansions in every country of the world?

What should be Ronaldo's third wish?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?