Area and Perimeter 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 should its breadth be decreased so that its area remains unchanged?
एक आयत की लंबाई में 25% की वृद्धि की जाती है।
उसका क्षेत्रफल अपरिवर्तित रखने के लिए उसकी चौड़ाई में कितने प्रतिशत की कमी करनी चाहिए?
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
B. 20%
Explanationव्याख्या
For unchanged area, 1.25 × new breadth factor = 1.
So breadth factor = 1
1.25 = 0.8.
Hence breadth must decrease by 20%.
क्षेत्रफल समान रखने के लिए 1.25 × नई चौड़ाई का गुणक = 1।
अतः चौड़ाई का गुणक = 0.8, इसलिए चौड़ाई में 20% कमी होगी। ---
Practice More Like This
Vitorr selects questions using the same topic, subject, exam and overlapping concepts—not just database order.
Related Quizzes
Continue with quizzes connected to Area and Perimeter and Math. Sign up is required only when you start a quiz.
Area and Perimeter of Circle - Complete Practice SetOpen quiz →UPSC CSAT 2027 Tough Practice Quiz Set 020 – Advanced DI, Mathematics, Probability & Logical ReasoningOpen quiz →UPSC CSAT 2027 Tough Practice Quiz Set 018 – Advanced Mathematics, DI, Probability & Analytical ReasoningOpen quiz →SSC CGL Tough Mathematics Practice Set 19 – 25 Questions | 15 MinutesOpen quiz →
Related Study Material
Mensuration Area and Perimeter Questions for SSC & Railway – 100 Bilingual MCQs with AnswersRead study article →Mathematics / गणित Surds and Indices Complete Notes करणी एवं घातांक सम्पूर्ण नोट्सRead study article →Mathematics Practice Set — 30 Questions गणित अभ्यास सेट — 30 प्रश्नRead study article →