Question

Aflati 3 numere stiind ca sunt direct proportionale cu numerele 15 28 si 40 si ca suma lor este 249

Answer 1

a/15=b/28=c/40=k
a/15=k⇒a=15k
b/28=k⇒b⇒=28k
c/40=k⇒c=40k
a+b+c=249
15k+28k+40k=249
83k=249
k=3
a=15·3=45
b=28·3=84
c=40·3=120