Răspuns:
Explicație pas cu pas:
0,2 = 2/10 = 1/5
0,6 = 6/10 = 3/5
1,2 = 12/10 = 6/5
x/5 = 3y/5 = 6z/5 = k
x = 5k
y = 5k/3
z = 5k/6
x + y + z = 20
5k + 5k/3 + 5k/6 = 20
30k/6 + 10k/6 + 5k/6 = 20
45k/6 = 20
k = 20*6/45 = 8/3
x = 5*8/3 = 40/3
y = 5/3*8/3 = 40/9
z = 5/6*8/3 = 20/9