Question

b+5 целых 9/10=7 целых 5/12

Answer 1

5 9/10= 59/10
7 5/12= 89/12
b=89/12-59/10
b=89*5/60-59*6/60
b=445/60-354/60
b=91/60
b= 1 целая 31/60