How much of an alloy that is 40% copper should be mixed with 600 ounces of an alloy that is 70% copper in order to get an alloy that is 60% ​copper?

Answer 1

Let x ouncs be amount of the alloy

And the total =x+600 ounces

Therefore the balance with respect to copper is

x⋅0.4+600⋅0.7=(x+600)⋅0.6

0.4x+420=0.6x+360

0.2x=60

x=1200 ounces

The amount is =1200 ounces