Question 22
Alloy compositions (lead, tin, zinc) are: $A=(30\%,70\%,0\%)$, $B=(0\%,80\%,20\%)$, $C=(10\%,50\%,40\%)$. Terry mixes nonnegative quantities to obtain alloy $T$ with $15\%$ lead. If $m,n$ are the maximum and minimum tin percentages, find $m-n$.
