Can you replace the question mark with the correct number in the below table sequence?

What number should come in place of the question mark below?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Why blonde cannot dial 911?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Bay of Bengal is in which state?

Five teams were competing in cricket where they faced each other exactly once. After the tournament, the following is the point table.

DareDevils 6
SuperKings 5
Royals 4
Sunrisers 2
Riders ?

How many points did Riders end up with?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?