A milk vendor sells milk at Cost Price but still gains 20%. Find the ratio of milk and water in every gallon that he sells.  Choose the correct option:  A) 4:1  B) 5:1  C) 5:2  D) 6:1  E) None of these
Let the vendor buy 100 L of milk. For him to make 20% profit, he has to turn this 100 L into 120 L without incurring any cost. So he has to mix 20 L of water. So ratio of milk to water is 100/20= 
<gadget id="calculator">100/20</gadget>
<output>5</output>
5 ;ANSWER:5:1
<result>B</result>
A milk vendor sells milk at Cost Price but still gains 20%. Find the ratio of milk and water in every gallon that he sells.