Question

Mark (✓) against the correct answer
If 7 : x :: 35 : 45, then x = ?

(a) 11
(b) 15
(c) 9
(d) 5

Answer 1

(c) 9

$$\begin{gathered} 7\times 45=x\times 35(\mathrm{Product}\mathrm{of}\mathrm{extremes}=\mathrm{Product}\mathrm{of}\mathrm{means}) \\ \Rightarrow 35x=315 \\ \Rightarrow x=9 \end{gathered}$$