A dishonest milkman professes to sell milk at cost price but he mixes water into the milk and therefore he gains by 25%. Find ratio of mixture to milk.

 4  :  3

Gain is because of added water

CP  =  Milk Price

SP – CP  =  Water added (Profit)

25%  =  \(\frac{1}{4}\)       

Milk  :  Water   :     Mixture

  3    :     1      :          4

Mixture  :  Milk  =  4  :   3