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Q: In what proportion water must be added to spirit to gain 20% by selling it at the cost price ?

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Answer :
Explanation :

Let the C.P of spirit be = Rs.10 per litre Then S.P l litre of the mixture = Rs. 11 Profit = 20%   Therefore, C.P of the mixture = Rs. 100120×10 = Rs. 25/3 per litre    Therefore, Ratio of water and spirit = 1 : 5

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