जर एक संख्या, त्या संख्येच्या 50% आणि त्या संख्येच्या 25% यांची सरासरी 280 असेल, तर ती संख्या कोणती?

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UPPSC Civil Service 2016 Official Paper 2
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  1. 280
  2. 480
  3. 360
  4. वरीलपैकी नाही

Answer (Detailed Solution Below)

Option 2 : 480
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दिलेले आहे:

सरासरी 280 आहे.

वापरलेले सूत्र:

सरासरी = निरीक्षणांची बेरीज/निरीक्षणांची संख्या

गणना:

संख्या 'x' मानू 

प्रश्नानुसार,

⇒ (x + x च्या 50% + x च्या 25%)/3 = 280

⇒ (x + x/2 + x/4)/3 = 280

⇒ 7x/12 = 280

⇒ 480

∴ ती संख्या 480 आहे.

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