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The energy efficiency of a car is approximately 20%. If you put 10 gallons of gas into the car, how many gallons are “wasted”?
First, you find what 20% of 10 gallons of gas would be. This will show how many gallons the car actually uses. 10 gallons x 20% = 10 x 0.20 = 2 gallons used
Then you subtract that number from the total 10 gallons to get how many gallons of gas would be wasted. 10 gallons - 2 gallons = 8 gallons of gas wasted
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