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An 8-cylinder Crown Victoria gives 18 miles per gallon in city driving and 21 miles per gallon in highway driving. A 300-mile trip required 15.5 gallons of gasoline. How many whole miles were driven in the city?

An 8cylinder Crown Victoria gives 18 miles per gallon in city driving and 21 miles per gallon in highway driving A 300mile trip required 155 gallons of gasoline class=

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Answer:

Step-by-step explanation:

let he drives at 21 m/hr=x gallons

gas used at 18 m/hr=15.5-x

21x+18(15.5-x)=300

divide by 3

7x+6(15.5-x)=100

7x+93-6x=100

x=100-93=7 gallons

gas used in city=15.5-7=8.5 gallons

distance travelled in city=18×8.5=153 miles

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