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125 gallons of  mixture of milk and water contains 20%  water. What amount of water needs to be added to this milk-water mixture in order to increase the percentage of water to 25% of the new mixture?
  1. 7
  2. 5.66
  3. 8.33
  4. 9


Solution

The correct option is C 8.33

Option c

We need to find out how much of a solution of  100% water needs to be added to a solution containing 20%   water to attain a dilution of 25%  . This can be found using allegation out as follows

 

Ratio = 75:5 = 15:1

That is for 15 parts of a 20%   water solution, one part of 100%   water solution needs to be added. Therefore, for a solution of  125 gallons, 12515=8.33 gallons needs to be added

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