Question

Trei numere sunt proportionale cu 25% , 20% , respectiv 15% din suma lor. Ce fractie  din suma reprezinta fiecare numar?

AS DORI O REZOLVARE COMPLETA!

Answer 1

$\dfrac{x}{\frac{25S}{100}}=\dfrac{y}{\frac{20S}{100}}=\dfrac{z}{\frac{15S}{100}}=\dfrac{S}{\frac{60S}{100}}=\dfrac53$

$x=\dfrac S4\cdot\dfrac53=\dfrac{5S}{12}$

$y=\dfrac S5\cdot\dfrac53=\dfrac S3$

$z=\dfrac{3S}{20}\cdot\dfrac53=\dfrac S4$