a new washing machine uses 40% less water tha...
a new washing machine uses 40% less water than an older model. a family used 1,200 gallons of water per month to run the old washing machine. about how much water will they use each month to run the new washing machine?\na 580 gal\nb 360 gal\nc 840 gal\nd 720 gal
Answer
# Explanation:
## Step1: Calculate water - saving amount
The water - saving amount is 40% of 1200 gallons. So, the water - saving amount $= 0.4\times1200 = 480$ gallons.
## Step2: Calculate water used by new machine
The water used by the new machine is the water used by the old machine minus the water - saving amount. So, water used by new machine $=1200 - 480=720$ gallons.
# Answer:
D. 720 gal