Percentage practice question for Railways, SSC. Review the correct answer and explanation, then continue with related practice below.
The length of a rectangle is increased by 25%. By what percentage must its breadth be decreased so that its area remains unchanged?
एक आयत की लंबाई में 25% की वृद्धि की जाती है।
क्षेत्रफल समान रखने के लिए उसकी चौड़ाई में कितने प्रतिशत की कमी करनी होगी?
Answer and explanation are free to read — no sign-in required.उत्तर और व्याख्या पढ़ने के लिए साइन-इन आवश्यक नहीं है।
Correct Answerसही उत्तर
C. 20% / 20%
Explanationव्याख्या
New length = 125% of original.
To keep area unchanged, new breadth = 100
125 = 80% of original breadth.
Hence breadth must decrease by 20%.
नई लंबाई मूल की 125% होगी।
क्षेत्रफल समान रखने के लिए नई चौड़ाई मूल की 80% होनी चाहिए।
अतः चौड़ाई में 20% कमी करनी होगी।
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