<PRE><B>Question 758413</B>
Alloy A contains x percent silver
Allow B contains y percent silver


5 parts A and 3 parts B:
{{{(5x+3y)/(5+3)=52}}}
{{{5x+3y=8*52}}}
{{{highlight(5x+3y=216)}}}


5 parts A and 11 parts B:
{{{(5x+11y)/(5+11)=42}}}
{{{5x+11y=16*42}}}
{{{highlight(5x+11y=672)}}}


Two simultaneous linear equations in two variables.  Solve them as a system.</PRE>