4 litres of water is mixed in certain amount of pure milk whose cost is Rs. 3 per litre. If the dishonest milkman earns a profit of 20% by selling the mixture at initial price then what is the quantity of pure milk obtained by the customer?	Choose the correct choice: A) 24 B) 20 C) 18 D) 25 E) None of these
cost given = Rs 3/ltr.   i.e cost earned through water mixture= 4*3= 
<gadget id="calculator">4*3</gadget>
<output>12</output>
12 rs   therefore earned 20%, that is on water .. therefore total earned= 12*100/20= 
<gadget id="calculator">12*100/20</gadget>
<output>60</output>
60 rs.   hence 60/3= 
<gadget id="calculator">60/3</gadget>
<output>20</output>
20 ltr overall mixture!   ANSWER:20
<result>B</result>
4 litres of water is mixed in certain amount of pure milk whose cost is Rs. 3 per litre. If the dishonest milkman earns a profit of 20% by selling the mixture at initial price then what is the quantity of pure milk obtained by the customer?