A golf course in Phoenix, Arizona, uses an average of 80 million gallons of water daily for irrigation. An average family of four (also living in Phoenix, AZ) uses 325,851 gallons of water per year. Rounded to the nearest ten, how many families of four can one golf course provide water for?

First find the golf course’s yearly water use: 80,000,000 gallons per day × 365 days = 29,200,000,000 gallons. Divide by a family’s yearly use: 29,200,000,000 ÷ 325,851 ≈ 89,611 families. Rounded to the nearest ten, that is 89,610 families, choice A.

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