Discussion
The length of a rectangular plot is 20 metres more than its breadth. If fencing the plot at Rs. 26.50 per metre costs Rs. 5300, what is the length of the plot in metres?
Answer: D
The fencing runs round the perimeter, so divide the cost by the rate.
\[ \text{perimeter} = \frac{5300}{26.50} = 200 \text{ m} \]
\[ 2\big((b + 20) + b\big) = 200 \quad\Longrightarrow\quad 2b + 20 = 100 \]
\[ b = 40 \text{ m}, \qquad l = 60 \text{ m} \]
The length is 60 m, which appears nowhere among the choices, so the answer is none of these. The 40 m on offer is the breadth - a genuine intermediate value, but not what was asked.
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