An Olympic-sized pool, which holds 660,000 gallons of water, is only 63% full. The pool maintenance company adds more water, filling the pool to 90% full. How many gallons of water did they add?

The amount of water added by the pool maintenance to make the pool 90% full is 178,200 gallons.

Step-by-step explanation:

The amount of water an Olympic-sized pool can hold is, 660,000 gallons.

The pool is 63% full at the moment.

The of water in the pool now is:

If the pool is 90% full then the amount of water in the pool is:

The amount of water added by the pool maintenance is:

Amount of water added = 90% of 660,000 - 63% of 660,000

Thus, the amount of water added by the pool maintenance to make the pool 90% full is 178,200 gallons.

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