why number 8549176320 is one of a kind?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

Why do you find that most of the buildings are deprived of the 13th floor?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I know a nine-letter word having only one vowel.
Do you ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Replace the question mark with the correct number below.