Question 1116744
{{{(63x+43*20)/(x+20)=59}}}


{{{63x+43*20=59(x+20)}}}

{{{63x+860=59x+1180}}}

{{{4x=1180-860}}}

{{{4x=320}}}

{{{x=80}}}--------Add 80 grams of the 63% copper



Amount of new alloy made:   100 grams