How much coffee of variety A, costing Rs. 5 a kg
should be added to 20 kg of Type B coffee at Rs.
12 a kg so that the cost of the two coffee variety
mixture be worth Rs. 7 a kg?
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coffee of variety A, costing Rs. 5 a kg
should be added to 20 kg of Type B coffee at Rs.
12 a kg so that the cost of the two coffee variety
mixture be worth Rs. 7 a kg
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