An amount of money is to be divided between P, Q and R in the ratio of 3:7:12. If the difference between the shares of P and Q is Rs.3200, what will be the difference between Q and R's share?  Answers: A) 2788 B) 4000 C) 7282 D) 2782 E) 2729

Rationale: "4 - - - 3200 5 - - - ? = > 4000 answer : b"
Answer: B