Question
Mishti bought 20 kg apples for Rs 60 per kg, b kg apples for Rs 70 per kg and (b + 6) kg apples for Rs 50 per kg. She mixed all type of apples together and the average cost price of 1 kg apples is Rs 58. Find the quantity of apples that is bought at Rs 50 per kg.
Solution
According to the question,
20 × 60 + b × 70 + (b + 6) × 50 = 58 × (20 + b + b + 6)
1200 + 70b + 50b + 300 = 58 × (26 + 2b)
1500 + 120b = 1508 + 116b
4b = 8
b = 2
Quantity of apples that is bought at Rs 50 per kg = 2 + 6 = 8 kg
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