In America, a person uses about 100 gallons of water each day, which is equal to 1,600 water-filled drinking glasses. How many water-filled drinking glasses would 281 Americans fill in a weeks time?

Each person fills 1,600 glasses in one day. For 281 people, that is 1,600 × 281 = 449,600 glasses per day; for 7 days, 449,600 × 7 = 3,147,200 glasses. The correct choice is 3,147,200 water-filled glasses.

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