What does this below rebus puzzle mean?

Why is a river so rich ?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Okay before we begin with the puzzle, do keep in mind that you have to answer it quickly.

You are participating in a car race. Seeking the perfect moment, you overtake the second person in the race. What positions are you in now?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

How many bananas can you eat if your stomach is empty?

In the picture given below, can you find out which digit will take place of the question mark?

Can you find out which options fits best with the missing column?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?