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Linear Equations in One Variable

SAT Math· difficulty 4/5

How much pure water must be added to 3030 ounces of a 25%25\% acid solution to dilute it to a 15%15\% acid solution?

  • A

    24 ounces

  • B

    18 ounces

  • C

    20 ounces

    check_circle
  • D

    15 ounces

Explanation

Acid stays 0.25(30)=7.50.25(30) = 7.5 oz. New total: 7.5=0.15(30+w)7.5 = 0.15(30 + w), so 50=30+w50 = 30 + w and w=20w = 20 oz.

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