TU X) Aflate, numerele x, y, z stund co direct proportionale au sums 42. X₁7, sunt numerel 5; 6n ^ 1 6 m' си

Răspuns:
x/5=y/6=z/6=k
x=5k. y=6k. z=6k
x+y+z=42
17k=42
k=2,47