A sum of money is to be divided among P, Q and R in the ratio 7 : 9 : 4. If P gets Rs. 1500 more than R then find the difference between the shares of P and Q.

Rs.1,000

P  :  Q  :  R 

7  :  9  :  4

Difference between the shares of P and R = 1500

                                                     3x    = 1500

                                                       x    = 500   

Difference in the shares of P and Q = 2x = रु. 1000