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Ratios, Rates, Proportional Relationships, and Units

SAT Math· difficulty 4/5

A car uses 0.050.05 gallons per mile. Gas costs \4.20/gal.Whatisthecostper/gal. What is the cost per 100$ miles?

  • A

    $25

  • B

    $18

  • C

    $15

  • D

    $21

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Explanation

0.05⋅100=50.05 \cdot 100 = 5 gal. 5⋅4.20=215 \cdot 4.20 = 21.

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