Linear Functions

SAT Math· difficulty 2/5

A car uses fuel at a constant rate. After driving 60 miles, the tank holds 12 gallons; after 180 miles it holds 8 gallons. How many gallons per mile is the car using?

  • A

    1/301/30

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  • B

    1/401/40

  • C

    1/601/60

  • D

    1/501/50

Explanation

Change: 4-4 gallons per 120120 miles, i.e., 4/120=1/304/120 = 1/30 gallons per mile.

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