Answer & Solution
Answer: Option C
Solution:
Let C.P. of 1 litre milk be Rs. 1
Then, S.P. of 1 litre of mixture = Rs. 1, Gain = 25%
C.P. of 1 litre mixture = Rs. $$\left( {\frac{{100}}{{125}} \times 1} \right)$$ = $$\frac{4}{5}$$
By the rule of alligation, we have:
∴ Ratio of milk to water = $$\frac{4}{5}$$ : $$\frac{1}{5}$$ = 4 : 1
Hence, percentage of water in the mixture = $$\left( {\frac{1}{5} \times 100} \right)$$ % = 20%