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How many kilograms of sugar costing R...

How many kilograms of sugar costing Rs 9 per kg must be mixed with 27 kg of sugar costing Rs 7 per kg so that there may be a gain of 10% by selling the mixture at Rs 9.24 per kg? (a) 36 kg       (b) 42 kg      (c) 54 kg       (d) 63 kg

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