Question

120:с=4.
с×9=810.
с:8=60

Answer 1

120 : с = 4
с = 120 : 4
с = 30

с * 9 = 810
с = 810 : 9
с = 90

с : 8 = 60
с = 60 * 8
с = 480

Answer 2

С=120:4=30
С=810:9=90
С=60*8=480