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How many kg of cashews costing Rs 7 per kg must be mixed with 20 kg of almonds costing Rs 19 per kg, so that a gain of 50% is made by selling the mixture at Rs 18 per kg?

1. How many kg of cashews costing Rs 7 per kg must be mixed with 20 kg of almonds costing Rs 19 per kg, so that a gain of 50% is made by selling the mixture at Rs 18 per kg?

 

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