k+60=2000:8 ,350:c=50 ,720:b=20, b*30=150
k+60=2000:8 350:c=50 720:b=20 b*30=150
k+60 =250 с=350:50 b=720:20 b=150:30
k=250-60=190 с=7 b=36 b=5
k+60=2000:8 720:b=20,
k+60=250 b=720:20
k=250-60 b=36
k=190
350:c=50 b*30=150
с=350:50 b=150:30
с=7 b=5