Question

How much of an alloy with 30% copper must be added to 25 pounds of a second alloy which is 20% copper to create a 27% alloy?

Answer 1

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Answer 2

(.15)(20) + (.10)(x) = (.12)(20 + x)
3 + .1x = 2.4 +.12x
3 - 2.4 = .12x - .1x
.6 = .02x
x = 30 pounds of Alloy 2

For the second problem, see if you can arrive at the key equation,
(.30)(x) + (.20)(25) = (.27)(x + 25)
Hope this helps.

Answer 3

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