ఒక సంఖ్య, ఆ సంఖ్యలో 50%, అదే సంఖ్యలో 25% యొక్క సగటు 280 అయితే, ఆ సంఖ్య ఏ౦టి?  

This question was previously asked in
UPPSC Civil Service 2016 Official Paper 2
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  1. 280
  2. 480
  3. 360
  4. పైవేవీ కాదు

Answer (Detailed Solution Below)

Option 2 : 480
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Detailed Solution

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ఇవ్వబడినవి:

సగటు 280.

ఉపయోగించిన ఫార్ములా:

సగటు = పరిశీలన మొత్తం/పరిశీలన సంఖ్య

లెక్కింపు:

సంఖ్య x గా ఉండనివ్వండి

ప్రశ్న ప్రకారం,

⇒ (x+ xలో 50% + xలో 25%)/3 = 280

⇒ (x + x/2 + x/4)/3 = 280

⇒ 7x/12 = 280

⇒ 480

∴ సంఖ్య 480.

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