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How many kg of rice costing Rs 6 per kg must be mixed with 40 kg of sugar costing Rs 11 per kg, so that a gain of 10% is made by selling the mixture at Rs 11 per kg?

1. How many kg of rice costing Rs 6 per kg must be mixed with 40 kg of sugar costing Rs 11 per kg, so that a gain of 10% is made by selling the mixture at Rs 11 per kg?

 

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