In what ratio must water be mixed with milk to gain 1623% on selling the mixture at cost price?  Select the correct option:
A) 6 : 1
B) 1 : 6
C) 1 : 4
D) 4 : 1
E) None of these
Explanation :   Let CP of 1 litre milk = Rs.1SP of 1 litre mixture = CP of 1 litre milk = Rs.1Gain=1623%=503%CP of 1 litre   mixture = 100(100+Gain%)×SP=100(100+503)×1=100(3503)=300350=67 1 : 6y the rule of alligation, we   have   CP of 1 litre water CP of 1 litre milk   0 1   CP of 1 litre mixture   6/7   1 - 6/7 = 1/7 6/7 - 0 = 6/7   Quantity of water : Quantity of milk = 1/7 : 6/7 = 1 : 6   Answer : Option 1 : 6
<result>B</result>
In what ratio must water be mixed with milk to gain 1623% on selling the mixture at cost price?