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Linear Equations in One Variable

SAT Math· difficulty 4/5

Pure water (0% salt) is mixed with a 25% saline solution to make 80 liters of 10% saline. How many liters of pure water?

  • A

    32

  • B

    48

    check_circle
  • C

    56

  • D

    40

Explanation

0⋅w+0.25⋅s=0.10⋅80=80 \cdot w + 0.25 \cdot s = 0.10 \cdot 80 = 8 and w+s=80w + s = 80. So s=32s = 32, w=48w = 48.

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