Question

How much of an alloy that is 40% copper should be mixed with 500 ounces of an alloy that is 70% copper in order to

get an alloy that is 60% copper?
☐ounces

Answer 1

250 ounces of 40% percent copper alloy

Explanation:

Let a be the number of ounces of 40% copper alloy.

`.4a + .7(500) = .6(500 + a)`

`.4a + 350 = 300 + .6a`

`.2a = 50`

`2a = 500`

`a = 250`

250 ounces of 40% copper alloy.