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12 kg of rice costing ₹30 per kg is mixed with 8 kg of rice costing ₹40 per kg. The average price per kg of the mixed rice is:

1. ₹38
2. ₹37
3. ₹35
4. ₹34

Correct answer: ₹34

Solution

The total cost is 12 × 30 + 8 × 40 = 360 + 320 = 680. The total quantity is 12 + 8 = 20 kg, so the average price per kg is 680/20 = 34.

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