Rectangle — Ratio 5 : 3 and Length 8 m More: The ratio of length to breadth is 5 : 3, and length is 8 m more than breadth. Find the area (in square metres).
Aptitude
Area
Difficulty: Easy
Choose an option
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A300 sq m
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B250 sq m
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C240 sq m
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D185 sq m
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E196 sq m
Answer
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:
- L : B = 5 : 3
- L = B + 8
- Units in metres
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:
- 300 and 250 assume other k values.
- 185 and 196 do not match the derived dimensions.
Common Pitfalls:
- Mistaking which term in the ratio corresponds to length vs breadth.
Final Answer:240 sq m.