Question

Va rog mult :Numerele a si b sunt respectiv direct proportionale cu 2 si 5.Cat la suta reprezinta nr a din nr b ?

Answer 1

[tex] \frac{a}{2} = \frac{b}{5} \\ b= \frac{5a}{2} \\ \frac{x}{100}*a=b \\ \frac{x}{100}*a= \frac{5a}{2} \\ x= \frac{5a}{2}* \frac{1}{a}*100= \frac{500}{2} =250[/tex]

Answer 2

 [tex]\frac{a}{2}=\frac{b}{5} \,conf. proprietatiilor\, proportiilor\, derivate\,,\\ cu \,aceleasi \,termeni\;\rightarrow\;\frac{a}{b}=\frac{^{20)}2}{5}=\frac{40}{100}=40^o/_o[/tex]