сравни
420:6...4200:60
150*10...15*100
36:9...360:90
5600:800...56:8
240*30...300*24
7200:90...7200:80

420:6=4200:60
......70=70
150*10=15*100
....1500=1500
36:9=360:90
.....4=4
5600:800=56:8
...............7=7
240*30=300*24
.....7200=7200
7200:90<7200:80
..........80 <90