Найдите значение выражения:20:(6 3/11+1 8/11)+(7 2/5- 5/8):5.Ребята или девчата помогите...

Решите задачу:

$20:(6 \frac{3}{11} +1 \frac{8}{11} )+(7 \frac{2}{5} - \frac{5}{8} ):5=3,855 \\ 1)6 \frac{3}{11} +1 \frac{8}{11} =7 \frac{11}{11} =8 \\ 2)20:8= \frac{20}{8} = \frac{5}{2} =2 \frac{1}{2} \\ 3)7 \frac{2}{5} - \frac{5}{8}=7 \frac{16}{40} - \frac{25}{40}=6 \frac{56}{40} - \frac{25}{40}=6 \frac{31}{40} \\ 4)6 \frac{31}{40} :5= \frac{271}{40}* \frac{1}{5} = \frac{271}{200} =1 \frac{71}{200} \\ 5)2 \frac{1}{2} +1 \frac{71}{200}=2 \frac{100}{200} +1 \frac{71}{200}=3 \frac{171}{200} =3,855 \\$