Answer : Option B
Explanation :
lb = 460 m2 ------(Equation 1)
Let the breadth = b
$MF#%\text{Then length, l = }b \times \dfrac{(100 + 15)}{100} = \dfrac{115b}{100}\text{------(Equation 2)}$MF#%
$MF#%\begin{align}
&\dfrac{115b}{100} \times b = 460\\\\
&b^2 = \dfrac{46000}{115} = 400\\\\
&\Rightarrow b = \sqrt{400} = 20\text{ m}
\end{align} $MF#%
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