Question 1188336
A grams of the first alloy
{{{(0.45*A+25)/(A+25)=0.56}}}


{{{0.45A+25=0.56A+0.56*25}}}

{{{0.56-0.45A=25-0.56*25}}}

{{{0.11A=11}}}

{{{highlight_green(A=100)}}}-----------the amount of the original alloy used.
The NEW alloy is this plus 25 grams of the zinc.


The new alloy:
{{{(30)/125}}}



24% Copper