20 मीटरच्या बाजू असलेल्या एका चौरस उद्यानाच्या मध्यभागी प्रत्येकी 2 मीटर रुंद दोन रस्ते आहेत आणि त्याच्या लांबी आणि रुंदीच्या समांतर आहेत. मार्गावर खडी टाकण्यासाठी रु. 100/मी2 या दराने किती खर्च येईल?

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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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Detailed Solution

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दिलेले आहे:

उद्यानाची बाजू = 20 मी

रस्त्याची रुंदी = 2 मी

मार्गावर खडी पसरण्याचा दर = 100/मी2

आकृती:

गणना:

रस्त्याचे क्षेत्रफळ = चौरसाची लांबी आणि चौरसाच्या रुंदीसह आयताकृती मार्गाचे क्षेत्रफळ - सामान्य चौरस क्षेत्र

⇒ 2 × (20 × 2) - 2 × 2 = 80 - 4 = 76 मी2

∴ मार्गावर खडी टाकण्याचा खर्च = 76 × 100 = 7,600 रुपये.

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