Răspuns :
a:b=4⇒a=4b
a+b=350
4b+b=350
5b=350
b=350:5
b=70
a=4x70
a=280
Verificare : 280+70=350
a+b=350
4b+b=350
5b=350
b=350:5
b=70
a=4x70
a=280
Verificare : 280+70=350
a:b= 4 ⇒ a = 4b (1)
a+b = 350 (2)
Cu (1) in (2) ⇒
4b+b = 350
5b =350 / :5
b =70
a= 4 x 70
a= 280
a+b = 350 (2)
Cu (1) in (2) ⇒
4b+b = 350
5b =350 / :5
b =70
a= 4 x 70
a= 280