Question

 Numerele x si y sunt direct proportionale cu 5 si 4 . Aflati numerele stiind ca x+y=4 100.

Answer 1

{x;y} d.p. {5;4}=> x/5=y/4=K=> x=5k    y=4k
5k+4k=4100
9k=4100
k=4100/9
x=4100/9*5=25000/9
y=4100/9*4=16400/9

Answer 2

x/5=y/4=k    x=5k    y=4k      5k+4k=4100  9k=4100 k=4100/9                        x=4100/9 ori 5    y=4100/9ori 4