Question

The average amount of water used per person each day in a country is 45 gallons. How much water does the average person use in one year?

Answer 1

Proportions

It's assumed the amount of water consumed by one person is proportional to the time.

The contant of proportionality is given as 45 gal/day.

Since one normal year has 365 days, then we use the same proportion to calculate the water used in one year as follows:

Water used = 45 * 365 = 16,425 gallons.

The average person uses 16,425 gallons.of water in one year