2012PP-II-12

16-06-2021 app.cch No Comments

Ans: A

\begin{array}{rcl} (α + β) : (3 α - β) & = & 7 : 3 \\ \frac{α + β}{3 α - β} & = & \frac{7}{3} \\ 3 α + 3 β & = & 21 α - 7 β \\ - 18 α & = & - 10 β \\ \frac{α}{β} & = & \frac{5}{9} \\ α : β & = & 5 : 9 \end{array}