Three varieties of nuts costing Rs. 40, Rs. 50 and Rs. 70 per kg are mixed in the ratio 2 : 3 : 1. What is the cost of the mixture per kg?
Correct answer C. Rs. 50
Explanation
Cost of 6 kg = 2 x 40 + 3 x 50 + 1 x 70 = Rs. 300, so cost per kg = 300/6 = Rs. 50. Rs. 53.33 is the simple average ignoring the ratio.
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