The ratio between the length and breadth of a rectangular field is 5:4. If the breadth is 20 meters less than the length. The perimeter of the field is_________?
Correct answer: C. 360m
- A. 260m
- B. 280m
- C. 360m
- D. None of these
Explanation
Let the length and breadth be 5x m and 4x m. Their difference is x m, so x = 20 m; hence the dimensions are 100 m and 80 m, and the perimeter is 2(100 m + 80 m) = 360 m. The likely mistake is choosing 280 m by adding the dimensions without multiplying their sum by 2.
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