SOLUTION: How many pounds of a 15% aluminum alloy must be mixed with 500 lb of a 22% aluminum alloy to make a 20% aluminum alloy?

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Question 406737: How many pounds of a 15% aluminum alloy must be mixed with 500 lb of a 22% aluminum alloy to make a 20% aluminum alloy?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Let x represent the lbs of 15% aluminum

Question states***

  'Mixing' to form (500+x)lbx of 20%

 .15x + .22*500 = .20(500+x)

Solving for x

   .02*500= .05x

    .02*500/.05= x =200lb, the amount of 15% aluminum



CHECKING our Answer***

  30 + 110 = .20*700 = 140