20 * к = 4200
к = 4200 : 20
к = 210
20 * 210 = 4200
4200 = 4200
m * 900 = 63000
m = 63000 : 900
m = 70
70 * 900 = 63000
63000 = 63000
2400 : n = 120
n = 2400 : 120
n = 20
2400 : 20 = 120
120 = 120
p : 35 = 70000
p = 70000 * 35
p = 2450000
2450000 : 35 = 70000
70000=70000