Question

Solve the following.

In 10 hours 8 pumps can empty 74,400 gallons of water. How many gallons of water can be emptied in 6 hours by 12 pumps?

Answer 1

Let x gallons of water can be emptied in 6 hours by 12 pumps.

Number of gallons of water that is going to be emptied increases when the number of hours increase.

This is direct proportion.

Number of gallons of water that is going to be emptied increases when the number of pumps increase.

This is also a direct proportion.

The detailed proportions are:

No. of pumps	No. of hours	No. of gallons
8	10	74400
12	6	x

Thus, 66960 gallons of water can be emptied in 6 hours by 12 pumps.