| Pure milk costs Rs. 20 per litre. After adding water the milkman sells the mixture at the rate of Rs. 18 per litre, thereby making a profit of 25%. In what ratio does he mix the two? |
A) 18 : 7
B) 18 : 5
C) 12 : 7
D) 12 : 5
Correct Answer: A
Solution :
| Mean cost price |
| \[=Rs.\left( \frac{100}{125}\times 18 \right)=Rs.14.4per\text{ }litre\] |
| By the rule of alligation. |
 |
| required ratio \[=14.4:5.6=18:7\] |
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