Question

A family of five recently replaced its 5-gallon-per-minute shower heads with water-saving 2-gallon-per-minute shower heads. Each member of the family averages 8 minutes in the shower per day. In a 30-day period, how many fewer gallons of water will the family use with the new shower heads?
a. 60.
b. 800.
c. 2400.
d. 3600.
e. 7200.

Answer 1

Answer:

Option d.

Step-by-step explanation:

Number of family members = 5

Average time for shower = 8 minute per member

Time period = 30

Initial rate of water = 5-gallon-per-minute

Initial use of water is

$5\times 8\times 30\times 5=6000$

New rate of water = 2-gallon-per-minute

Use of water after new shower is

$5\times 8\times 30\times 2=2400$

Difference between use of water is

$6000-2400=3600$

It means the family will use 3600 fewer gallons of water with the new shower heads.

Therefore, the correct option is d.