यदि (x + y) का 20% = (x - y) का 25% है, तब y का कितना प्रतिशत x के बराबर है?

  1. 800%
  2. 900%
  3. 200%
  4. 500%

Answer (Detailed Solution Below)

Option 2 : 900%
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Detailed Solution

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दिया गया है:

(x + y) का 20% = (x - y) का 25%

प्रयुक्त अवधारणा:

प्रतिशत = (प्राप्त मान/कुल मान) × 100

गणना:

⇒ 20(x + y) = 25(x - y)

⇒ 20x + 20y = 25x - 25y

⇒ 20y + 25y = 25x - 20x

⇒ 45y = 5x

⇒ x = 9y

अब, प्रतिशत = (प्राप्त मान/कुल मान) × 100

⇒ (x/y) × 100

⇒ (9y/y) × 100 

⇒ 900%

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