420:а=60,360:х=90,х:6=70,х:7=70

Question

420:а=60,360:х=90,х:6=70,х:7=70

Answer 1

420:a=60
a=420:60
a=7

360:x=90
x=360:90
x=4

x:6=70
x=6*70
x=420

x:7=70
x=7*70
x=490