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

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Solve the following series:
AZ, GT, MN, __, YB

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

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Which number should replace the question mark?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59