वाळू आणि लोह यांच्या 1 किलो मिश्रणात 20% लोह आहे. लोहाचे प्रमाण 10% करण्यासाठी त्यात किती वाळू टाकावी ?

This question was previously asked in
CGPSC Civil Service 2019 Official Paper 2 (CSAT)
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  1. 2 किलो
  2. 1.5 किलो
  3. 1 किलो
  4. 0.5 किलो

Answer (Detailed Solution Below)

Option 3 : 1 किलो
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दिलेले आहे:

1 किलो मिश्रणात लोहाची टक्केवारी 20% आहे

गणना:

लोहाचे प्रमाण = 20/100 × 1000 = 200gm (1kg = 1000 gm)

वाळूचे प्रमाण = 1000 - 200 = 800 ग्रॅम

वाळूचे प्रमाण x मानू

प्रश्नानुसार;

⇒ 200/(1000 + x) = 10/100

⇒ 2000 = 1000 + x

⇒ x = 1000 gm = 1 किलो 

∴ वाळू मिसळलेले प्रमाण 1 किलो आहे.

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