A) 2 : 1
B) 1 : 2
C) 1 : 10
D) 1 : 20
Correct Answer: A
Solution :
\[\because \] \[10%\text{ of }m=\text{ }20%\text{ of }n\] \[\Rightarrow \] \[\frac{10m}{100}=\frac{20n}{100}\] \[\Rightarrow \] \[\frac{m}{10}=\frac{n}{5}\] \[\Rightarrow \] \[\frac{m}{n}=\frac{2}{1}\] \[\Rightarrow \] \[m:n=2:1\]
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