17 - 8.63 find the sum please thank you
1 answer:
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x = amount of the first alloy
y = amount of the second alloy
we know the first alloy is 25% copper, so then there is (25/100) * x of copper in it, namely 0.25x.
likewise, we know the second alloy is 75% copper so then there is (75/100) * y of copper or 0.75y.
he needs a 60 kgs mixture that 65% copper, or (65/100) * 60 = 39.