Question 5
Alloy M contains $95\%$ bronze, $4\%$ tin and $1\%$ zinc. Alloy N contains only bronze and tin. The source says M and N are mixed “in equal proportion”; the result contains $86\%$ bronze, $13.6\%$ tin and $0.4\%$ zinc. Find the percentage of bronze in N. (An alloy is a mixture of metals.)