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NOT: 15 ounces to make 10%

Correct answer:

Twenty ounces

Calculus:

Let it be M ounces. Then:

  • 20%*(M ounce) + 5%*(40 ounce) = 10%*(M+40 ounce)
  • 20*M + 200 = 10*M + 400
  • (20-10)*M = 400-200
  • 10M = 200
  • M = 20
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Q: How many ounces of 20 percent saline solution must be added to 40 ounces of a 5 percent saline solution to make a 10 percent saline solution?
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