Problema Solution
Anne and Nancy use a metal alloy that is 18.1% copper to make jewelry. How many ounces of an alloy that is 14% copper must be mixed with an alloy that is 23% copper to form 90 ounces of the desired alloy?
Answer provided by our tutors
0.14x + 0.23(90 - x) = 0.181(90)
14x + 23(90 - x) = 18.1(90)
14x + 2,070 - 23x = 1,629
9x = 441
x = 49
so: 49 ounces of 14% copper alloy