Question 971955
<pre>
ALLOY         PERCENT         QUANTITY           PURE
 'an'           30              60-x             30(60-x)
 'another       80               x               80x
Blend           51              60               51*60
</pre>
{{{30(60-x)+80x=51*60}}}.  Solve this for x.


{{{30*60-30x+80x=51*60}}}

{{{80x-30x=51*60-30*60}}}

{{{(80-30)x=60(51-30)}}}

{{{x=60((51-30)/(80-30))}}}

{{{x=60(21/50)}}}

{{{x=6*21/5}}}

{{{highlight(x=25.2)}}} of the "another" or 80% copper alloy and
{{{highlight(34.8)}}} of the 30% copper alloy.