Răspuns:
Explicație pas cu pas:
x/y = 9/4
x = 9y/4
x + y = 48
9y/4 + y = 48
9y/4 + 4y/4 = 48
13y/4 = 48
y = 4*48/13 = 192/13
x = 9/4*192/13 = 9*48/13 = 432/13