Two containers of milk contain mixtures of water and milk in ratio 5:4 and 7:9. In what ratio they should be mixed so that mixture is of 6:6 ratio?  Choose the correct choice from the following answers.
A) 6 : 5	B) 7 : 5	C) 9 : 8	D) 8 : 9	E) 8 : 7

Rationale: 6 / 6 - 5 / 4 = = > - 1 / 4 7 / 9 - 6 / 6 = = > - 2 / 9 now , - 1 / 4 = - 2 / 9 = = > 1 / 4 = 2 / 9 = = > 9 : 8 answer : c
Answer: C