Question

If a = 2b, then a : b =

(a) 2 : 1
(b) 1 : 2
(c) 3 : 4
(d) 4 : 3

Answer 1

It is given that,

$$\begin{gathered} a=2b \\ \Rightarrow \frac{a}{b}=\frac{2}{1} \\ \Rightarrow a:b=2:1 \end{gathered}$$

Hence, the correct option is (a).