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family has 2 cars

1st fuel efficiency=15 mpg

2nd fuel efficiency=35 mpg

total distance=1450 miles

total consumption=50 gal

lets get the gallons consumed by 1st car as x

then the gallons consumed by 2nd car=50-x

so we can write

total distance=15*x+(50-x)35

1450=15x+35*50-35x

20x=1750-1450

20x=300

x=15 g

so 50-x=35 g

the gas consumed by 1st car=15 gallons

the gas consumed by 2nd car=35 gallons

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