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Linear Equations in One Variable

SAT Math· difficulty 4/5

A pharmacist mixes a 10% saline with a 25% saline to make 60 mL of 15% saline. How many mL of the 25% solution?

  • A

    30

  • B

    20

    check_circle
  • C

    15

  • D

    25

Explanation

0.10(60−x)+0.25x=0.15(60)=90.10(60-x) + 0.25x = 0.15(60) = 9 → 6+0.15x=96 + 0.15x = 9 → x=20x = 20.

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