20) ($$ \frac{1}{3} $$ + $$ \frac{1}{4} $$) × 2,4 = $$ \frac{7}{12} $$ × 2,4 = $$ \frac{7}{12} $$ × $$ \frac{24}{10} $$ = $$ \frac{7}{1} $$ × $$ \frac{2}{10} $$ = $$ \frac{7}{1} $$ × $$ \frac{1}{5} $$ = $$ \frac{7}{5} $$ = 1 $$ \frac{2}{5} $$
Ответ: 1 $$ \frac{2}{5} $$