Помогите пожалуйста 16 1/4 - ( 8 2/5 + 3 3/10

$16 \times \frac{1}{4} - (8 \times \frac{2}{5} + 3 \times \frac{3}{10} ) = \\ \frac{65}{4} - ( \frac{42}{5} + \frac{33}{10} ) = \\ \frac{65}{4} - ( \frac{84 + 33}{10} ) = \\ \frac{65}{4} - \frac{117}{10} = \\ \frac{65 \times 5}{20} - \frac{117 \times 2}{20} = \\ \frac{325}{20} - \frac{234}{20} = \\ \frac{325 - 234}{20} = \frac{91}{20} = 4 \times \frac{11}{20}$
Ответ: 91/20