Difficulty: Easy
Correct Answer: 240 sq m
Explanation:
Introduction / Context:Rectangles with a given side ratio and an additive difference can be solved with a single variable. Convert the ratio to algebra, use the difference to find the scale, then compute area as length times breadth in square metres.
Given Data / Assumptions:
Concept / Approach:Let L = 5k and B = 3k. Then L − B = 2k = 8 ⇒ k = 4. Substitute back to get actual dimensions and multiply to obtain area. This linear system avoids guesswork and ensures consistency.
Step-by-Step Solution:
2k = 8 ⇒ k = 4.L = 5k = 20 m; B = 3k = 12 m.Area = 20 * 12 = 240 m^2.Verification / Alternative check:
Difference check: 20 − 12 = 8 (satisfied). Ratio check: 20 : 12 = 5 : 3.Why Other Options Are Wrong:
Common Pitfalls:
Final Answer:240 sq m.
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