question_answer

A man adds water to 25 L of pure milk and sells the mixture at Rs. 3 per L. If pure milk cost Rs. 3.60 per L. How many litres of water does he add?

A) 4 L                              

B) 5 L   

C) 6 L                              

D) 7 L

Correct Answer: B

Solution :

\[\frac{\text{Quantity}\,\,\text{of}\,\,\text{pure}\,\,\text{milk}}{\text{Quantity}\,\,\text{of}\,\,\text{water}}=\frac{3}{0.6}=\frac{30}{6}=\frac{5}{\text{L}}\]

\[\Rightarrow \]               \[5:1=25\]\[\Rightarrow \]\[x=5\,\,\text{L}\]