A swimming pool is 40 feet long by 20 feet wide.The entire pool is 4 feet deep. Given that 2 cu foot equals 7.5 gallon, how many gallons of water does the pool?

Question

volume of a cuboid

Answer 1

The volume of the pool is pretty straight-forward to calculate:

 

V = l×w×h

V = 40(20)(4)

V = 3200

 

The pool has 3,200 ft³ of water in it.

 

Since there are 7.5 gallons in 2 cubic feet, there are 7.5 g / 2 ft³ = 3.75 gallons per cubic foot.

 

The pool has 3200 cubic feet of water in it, which is 3200(3.75) = 12,000 gallons of water.

 

 

(That conversion factor isn't actually right, by the way. 2 cubic feet is actually equal to about 15 gallons. But it's usually best just to use the numbers the problem gives you.)