Question

(47 + х ) :10 = 12
(61 - х ) * 8 = 72

Answer 1

1) (47+х)/10=12
    47+х=12*10
    47+х=120
    х=120-47
    х=73
2) (61-х)*8=72
    61-х=72/8
    61-х=9
    х=61-9
    х=52