Question

Impartiti nr. 120 in parti direct proportionale cu nr. 2 si 4...va rog urgent...dau coroana si 15 pcte

Answer 1

a+b=120
{a,b}d.p.{2,4}
a=2k
b=4k
2k+4k=120
6k=120
k=20
a=2*20=40
b=4*20=80

Answer 2

$\frac{a}{2}=\frac{b}{2}=k \\ \frac{a}{2}=k$⇒$a=2k$
$\frac{b}{4}=k$⇒$b=4k$
$a+b=120 \\ 2k+4k=120 \\ 6k=120 \\ k=\frac{120}{6} \\ k=20 \\ a=2k=20*2=40 \\ b=4k=20*4=80$