Question

daca $\frac{x}{y}$=$\frac{2}{3}$.
$\frac{7x}{7x+y}$=?

Answer 1

$\frac{x}{y} = \frac{2}{3} \Rightarrow x=2k~si~y=3k. \\ \\ \frac{7x}{7x+y}= \frac{7 \cdot 2k}{7 \cdot 2k+3k}= \frac{14k}{17k}= \frac{14}{17}.$

Answer 2

x/y=2/3
3x=2y
x=2y/3
7x/(7x+y)= (14y/3)/(14y/3+y)=14y/3/(17y/3)=14/17