A dairyman pays Rs. 6.40 per liter of milk. He adds water and sells the mixture at Rs. 8per liter, thereby making 37.5% profit. The proportion of water to milk received by the customers is
Choose the most appropriate option
A) 1:10  B) 1:12  C) 1:15  D) 1:20  E) 1:25
Milk = m liters;   Water = w liters;   Cost of m+w liters = 6.4m;   Selling price of m+w liters = 8(m+w).   Given that 6.4m*1.375 = 8(m+w) --&gt; w/m=1/10.   1:10nswer: 1:10.
<result>A</result>
A dairyman pays Rs. 6.40 per liter of milk. He adds water and sells the mixture at Rs. 8per liter, thereby making 37.5% profit. The proportion of water to milk received by the customers is