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A Jeweler Needs to mix an Alloy with 16% Gold Content & an Alloy with a 28% Gold Content to Obtain 32oz. of a new Alloy with a 25% Gold Content. How Many oz. of Each of the Original Alloys Must be Used?

Monday, September 6th, 2010

Solution:

  • A = number of ounces of the first alloy
  • B = number of ounces of the second all
  • A+B=32
  • 0.16 A +0.28 B = 32 x 0.25
  • Since A + B = 32, we know that A = 32 – B. You can then re-write the equation above as 0.16 (32-B) + 0.28 B = 32 x 0.25
  • This can be simplified to 5.12- 0.16 B + 0.28 B =8
  • Or, 0.12 B = 2.88
  • Or B = 24
  • So A = 8

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