How much chlorine is in the pool?

Question

  The amount of chlorine in a swimming pool is proportional to the volume of water. The pool has 2.5 milligrams of chlorine per liter of water. There are 8000 gallons of water in the swimming pool. How much chlorine is in the pool? Round to the nearest thousand milligrams.

Answer 1

Set a proportion for liters and gallons to convert gallons to liters. 1 liter = .26 gallon

1/26 = x/8000 (since you are trying to find how many liters are in 8000 gallons)

Solve for x, by cross-multiplying, which should give you x=30,769 liters.

Next you need to find how much milligrams of chlorine per liter of water, so you set a proportion for that as well.

They give you that there is 2.5 milligrams of chlorine per liter of water.

If you have 30,769 liters, set a proportion

2.5mg / 1liter = x / 30,769 liters

Solve for x by cross multiplying.

This should give you 76,90mg.