why number 8549176320 is one of a kind?

What is the fastest way to double your money?

What came first, the chicken or the egg?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What breaks yet never falls, and what falls yet never breaks?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

What is red and smells like blue paint?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?