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A product has 15% Aluminium, 25% steel, 60% copper. If Aluminium content=5 kg, find copper content.

1. 15 kg
2. 18 kg
3. 20 kg
4. 24 kg

Correct answer: 20 kg

Solution

Al=15%: 0.15×W=5 → W=33.33 kg. Copper=60%×33.33=20 kg.

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