Question

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?
a.
449,600 water-filled glasses
b.
28,100 water-filled glasses
c.
3,147,200 water-filled glasses
d.
196,700 water-filled glasses

Answer 1

Each person uses 1,600 glasses per day. For 7 days that's 1,600 × 7 = 11,200 glasses per person per week.
For 281 people: 281 × 11,200 = 3,147,200.

Answer: c. 3,147,200 water-filled glasses.