a+b+c=603
[tex] \frac{b}{a}= \frac{1}{3}=>b= \frac{a}{3} [/tex]
[tex]c= \frac{7}{45}a [/tex]
Inlocuind in relatia de sus obtinem:
[tex]a+ \frac{a}{3}+ \frac{7}{45}a=603=> \frac{45a+15a+7a}{45}=603=> \\ \frac{67a}{45}=603=>a= \frac{603*45}{67}=405 \\ b= \frac{a}{3}= \frac{405}{3}=135 \\ c= \frac{7}{45}*405=63 [/tex]
