How many kg of sugar costing Rs. 45 per kg must be mixed with 20 kg of sugar costing Rs. 36 per kg so that the mixture costs Rs. 42 per kg?
Correct answer B. 40 kg
Explanation
Cheaper : dearer = (45 - 42) : (42 - 36) = 3 : 6 = 1 : 2. With 20 kg of the cheaper sugar, the dearer sugar needed = 40 kg.
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