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what should be mixed with spirit in _ : _ to gain 30% by selling it at cost price?

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The average weight of 'n' mens is 64 kg.two men whose weights are 68kg and 67 kg join them& man whose weight is between 50kg to 60 kg leaves them.the average is now increased by 2kg.what is the weight of the man who left them &the initial number of men is multiple of 5? in how many ways can six different things be divided between three persons