The marks obtained by Vijay and Amith are in the ratio 6:5 and those obtained by Amith and Abhishek in the ratio of 3:2. The marks obtained by Vijay and Abhishek are in the ratio of?  Choose one
A) 1 : 5  B) 4 : 5  C) 9 : 5  D) 9 : 8  E) 9 : 7

Rationale: "6 : 5 3 : 2 - - - - - - - 18 : 15 : 10 18 : 10 9 : 5 answer : c"
Answer: C