How many liters of water must be added to 20 liters of milk and water containing 10% water to make it 60% water?
Answers.
A) 12	B) 15	C) 18	D) 22	E) 25
By rule of alligation:   60% - 10% = 50%   100% - 60% 60  - 10= 
<gadget id="calculator">60  - 10</gadget>
<output>50</output>
50%   100% - 60% = 40%   Quantity of pure water : Quantity of the mixture  100  - 60= 
<gadget id="calculator"> 100  - 60</gadget>
<output>40</output>
40%   Quantity of pure water : Quantity of the mixture= 5 : 4   There are 20 liters of mixture, so we need to add 25 liters of pure water.   The answer is 25.
<result>E</result>
How many liters of water must be added to 20 liters of milk and water containing 10% water to make it 60% water?