20 मीटर भुजा के एक वर्गाकार पार्क में, उसके बीच से जाती हुई तथा उसकी लम्बाई और चौड़ाई के समानांतर प्रत्येक 2 मीटर चौड़ी दो सड़कें हैं। 100 रुपये/वर्ग मीटर की दर से मार्ग पर बजरी बिछाने की लागत कितनी है?

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RRB ALP Previous Paper 13 (Held On: 20 Aug 2018 Shift 2)
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  1. 7,200 रुपये
  2. 7,600 रुपये
  3. 8,800 रुपये
  4. 8,400 रुपये

Answer (Detailed Solution Below)

Option 2 : 7,600 रुपये
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दिया गया है:

पार्क की भुजा = 20 मीटर

सड़क की चौड़ाई = 2 मीटर

पथ पर बजरी बिछाने की दर = 100/मीटर2

आकृति:

20 aug 2nd Shift deepak  3

गणना:

सड़क का क्षेत्रफल = वर्ग की लंबाई और चौड़ाई के अनुदिश आयताकार पथ का क्षेत्रफल - उभयनिष्ठ वर्ग क्षेत्रफल

⇒ 2 × (20 × 2) - 2 × 2 = 80 - 4 = 76 मीटर2

∴ मार्ग पर बजरी बिछाने का व्यय = 76 × 100 = 7,600 रुपये

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