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How many kg of coffee powder costing Rs 7 per kg must be mixed with 91 kg of sugar costing Rs 25 per kg, so that a gain of 10% is made by selling the mixture at Rs 22 per kg?

1. How many kg of coffee powder costing Rs 7 per kg must be mixed with 91 kg of sugar costing Rs 25 per kg, so that a gain of 10% is made by selling the mixture at Rs 22 per kg?

 

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