Răspuns :
a+b+c=1000
a=7b
c-100=a
c=a+100= 7b+100
7b+b+7b+100=1000
15b=1000-100
15b=900
b=60
a=7*60=420
c=420+100=520
a=7b
c-100=a
c=a+100= 7b+100
7b+b+7b+100=1000
15b=1000-100
15b=900
b=60
a=7*60=420
c=420+100=520
a+b+c=1000
a=7xb
c=b+100
al.....l.....l.....l.....l.....l.....l.....l
bl.....l }1000
cl.....l.........l
100
(1000-100):9=900:9=100(b)
100x7=700(a)
100+100=200(c)
a=7xb
c=b+100
al.....l.....l.....l.....l.....l.....l.....l
bl.....l }1000
cl.....l.........l
100
(1000-100):9=900:9=100(b)
100x7=700(a)
100+100=200(c)