Question

Помогите решить.
(8целых 7/12-х):20=7/40

Answer 1

$(8 \frac{7}{12} - x) \div 20 = \frac{7}{40} \\ 8 \frac{7}{12} - x = \frac{7}{40} \times 20 \\ 8 \frac{7}{12} - x = \frac{140}{40} \\ 8 \frac{7}{12} - x = \frac{7}{2} \\ - x =3 \frac{1}{2} - 8 \frac{7}{12} \\ - x = 3 \frac{6}{12} - 8 \frac{7}{12} \\ - x = - 5 \frac{1}{12} \\ x = 5 \frac{1}{12}$