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SSC MTS & Havaldar 2019 · Question 45 of 73

एक घनाभ की लम्बाई और चौड़ाई में 10% की वृद्धि होती है, जबकि ऊं चाई 10% कम हो

  1. A8.9% वृद्धिCorrect
  2. B10% वृद्धि
  3. C8.9% कमी
  4. D10% कमी

Answer: A. 8.9% वृद्धि

Explanation

माना कि लम्बाई, चौड़ाई और ऊं चाई 10 है। तो, घनाभ का आयतन = लम्बाई × चौड़ाई × ऊं चाई ⇒ घनाभ का आयतन = 10 × 10 × 10 = 1000 भुजाओं की लम्बाई को परिवर्ति त करने के बाद घनाभ का आयतन = (110% × लम्बाई) × (110% × चौड़ाई) × (90% × ऊं चाई) ⇒ घनाभ का आयतन = 11 × 11 × 9 = 1089 इसलिए, परिवर्ति त आयतन = 1089 – 1000 = 89 ∴ परिवर्ति त आयतन% = (89/1000) × 100 = 8.9 %

Source: SSC MTS 2019 paper (16-Aug-2019 Shift 1) compilation with key+explanations, via prepp.in · reliable-secondary

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