Question

Determinati numerele x,y,z stiind ca ele sint direct proportionate cu 3, 4 si 5 iar x+y=35

Answer 1

x/3=y/4=z/5=k
x=3k
y=4k
z=5k
3k+4k=35 =>7k=35 =>k=5
=>x=15
=>y=20
=>z=25