1 கிகி மணல் மற்றும் இரும்பின் கலவையில், 20% இரும்பு உள்ளது. இரும்பின் விகிதத்தை 10% ஆக மாற்றுவதற்கு எவ்வளவு மணலைச் சேர்க்க வேண்டும்?

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CGPSC Civil Service 2019 Official Paper 2 (CSAT)
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  1. 2 kg
  2. 1.5 kg
  3. 1 kg
  4. 0.5 kg

Answer (Detailed Solution Below)

Option 3 : 1 kg
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கொடுக்கப்பட்டுள்ளவை:

1 கிகி கலவையில் இரும்பின் சதவீதம் 20% ஆகும்.

கணக்கீடு:

இரும்பின் அளவு = 20/100 × 1000 = 200கிராம்    (1கிகி = 1000 கிராம்)

மணலின் அளவு = 1000 - 200 = 800 கிராம் 

சேர்க்க வேண்டிய மணலின் அளவை x எனக்கொள்க 

கேள்வியின்படி;

⇒ 200/(1000 + x) = 10/100

⇒ 2000 = 1000 + x

⇒ x = 1000 கிராம் = 1 கிகி 

∴ சேர்க்க வேண்டிய மணலின் அளவு 1 கிகி.

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