Răspuns :
a/b = 7/3 => a = 7b/3
2a + 2b = 280
2(a+b) = 2·140
a+b = 140
7b/3 + b = 140
7b + 3b = 420
10b = 420
b = 42
a = 98
2a + 2b = 280
2(a+b) = 2·140
a+b = 140
7b/3 + b = 140
7b + 3b = 420
10b = 420
b = 42
a = 98