_:7=106 (ост 5) _:30=2 (ост20) _:57=1 (ост 2)

Question

_:7=106 (ост 5)
_:30=2 (ост20)
_:57=1 (ост 2)

Answer 1

106×7+5=747
747:7=106(ост.5)
30×2+20=80
80:30=2(ост.20)
57×1+2=59
59:57=1(ост.2)