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Linear Equations in Two Variables

SAT Math· difficulty 4/5

A 60% alcohol solution must be diluted with water to make 20 L of 25% alcohol. Liters of 60% solution needed:

  • A

    1212

  • B

    1515

  • C

    8138\frac{1}{3}

    check_circle
  • D

    1010

Explanation

0.60x=0.25(20)=5⇒x=5/0.60=25/3≈8.330.60x = 0.25(20) = 5 \Rightarrow x = 5/0.60 = 25/3 \approx 8.33.

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