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Linear Equations in One Variable

SAT Math· difficulty 4/5

A water tank empties at a constant rate. At t=0t = 0, it holds 200 gallons. At t=5t = 5 min, it holds 150 gallons. What is the rate of decrease (gal/min)?

  • A

    15

  • B

    20

  • C

    5

  • D

    10

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Explanation

Rate =200−1505=10= \frac{200 - 150}{5} = 10 gal/min.

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