Question

How much of an alloy that is 10 percent copper should be mixed with 500 ounces of an alloy that is 90?

Answer 1

So 500ounces is 90% of the alloy.
So 500:90
Now divide both sides by 9.
500/9:10
So thats
55.56:10 or
55 5/9:10
Or keep it as
500/9:10