A man buys milk at $50\ P$. a litre and after adding water sells it at $60\ P$. a litre thereby making a profit of $33\dfrac {1}{3}$ p.c. Find the proportion of water he has added
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A man buys milk at $50\ P$. a litre and after adding water sells it at $60\ P$. a litre thereby making a profit of $33\dfrac {1}{3}$ p.c. Find the proportion of water he has added