Komal bought 20 kg rice for Rs 30 per kg, b kg rice for Rs 35 per kg and (b + 4) kg rice for Rs 25 per kg. She mixed all type of rice together and the average cost price of 1 kg rice is Rs 29.6. Find the quantity of rice that is bought at Rs 25 per kg.

According to the question,

20 × 30 + b × 35 + (b + 4) × 25 = 29.6 × (20 + b + b + 4)

600 + 35b + 25b + 100 = 29.6 × (24 + 2b)

700 + 60b = 710.4 + 59.2b

0.8b = 10.4

b = 13

Quantity of rice that is bought at Rs 25 per kg = 13 + 4 = 17 kg

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