Răspuns:
a,b,c = numerele
a:4=b:3 =>3\times a=4\times t
a:4=2:c =>2\times a=4\times c =>a=2\times c
a = 2xb-40
2\times c=2\times b-40~1:2 c = b-20 =>b- c=2c
a
b
C
b-c = un segment = 20
a=4\times20=80
b=3\times20=60
c = 2x20 = 40
Verificare:
80:4 60:3
20 = 20
60-40 = 20
a=80
b=60
c=40
