If x : y = 3 : 5 and x - y = -2, then the value of x + y is?

Explanation:-

$$\eqalign{ & x:y = 3:5{\text{ }} \cr & x - y = - 2 \cr & \frac{x}{y} = \frac{3}{5} \cr & x - y = 3 - 5 \cr & \Leftrightarrow - 2 = - 2 \cr & x = 3,{\text{ }}y = 5 \cr & x + y = 3 + 5 \cr & \Leftrightarrow x + y = 8 \cr}$$