Question

How much of an alloy that is 30% copper should be mixed with 600 ounces of an alloy that is 60% copper in order to get an alloy fratis
40 copper?
ounces

Answer 1

9514 1404 393

Answer:

 1200 ounces

Step-by-step explanation:

Let x represent the weight of 30% copper that needs to be added to the mix. Then the total weight will be (600+x) ounces, and the amount of copper in the mix is ...

  0.30x +0.60(600) = 0.40(600 +x)

  0.3x +360 = 240 +0.4x . . . . . simplify

  120 = 0.1x . . . . . . . . . . . . . subtract 0.3x+240

  1200 = x . . . . . . . . . . multiply by 10

1200 ounces of 30% copper should be added to the mix.