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).

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:

  • 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.

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