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How many kg of sugar costing Rs 8 per kg must be mixed with 4 kg of coffee powder costing Rs 20 per kg, so that a gain of 25% is made by selling the mixture at Rs 20 per kg?

1. How many kg of sugar costing Rs 8 per kg must be mixed with 4 kg of coffee powder costing Rs 20 per kg, so that a gain of 25% is made by selling the mixture at Rs 20 per kg?

 

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