Discussion
If the perimeter of a rectangular garden is 600 m, its length when its breadth is 100 m is?
Answer: C
\[ 2(l + b) = 600 \quad\Longrightarrow\quad l + b = 300 \]
\[ l = 300 - 100 = 200 \text{ m} \]
Halving the perimeter first is essential - subtracting the breadth from the full 600 m would give 500 m.
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