Answer :
[tex]33\frac{1}{3}\% \cdot (25\% \cdot 60 - 75\% \cdot 16 )=\\ \\=\frac{100}{3}\cdot \frac{1}{100}\cdot (\frac{25}{100}\cdot 60-\frac{75}{100}\cdot 16) =\\ \\=\frac{1}{3}\cdot (\frac{1}{4}\cdot 60-\frac{3}{4}\cdot 16) =\frac{1}{3}\cdot (15-12) =\frac{1}{3}\cdot 3 =1[/tex]
