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David wants to fill his backyard swimming pool. His garden hose delivers 40 gallons in 5 minutes. How many gallons of water will be in the pool after 20 minutes? After 1 hour? EXPLIAN​

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musiclover10045

40 gallons /  5 minutes =  X gallons / 20 minutes:

Cross multiply:

40 * 20 = 5 *x

800 = 5x

Divide both sides by 5:

x = 800/5

x = 160 gallons after 20 minutes.

There are 3 20 minute periods in an hour

160 x 3 = 480 gallons in one hour.

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