An amount of money is to be distributed among P, Q and R in the ratio 3 : 5 : 7. If Q's share is Rs.1500, what is the difference between R’s and P’s shares?
1200
Given Q's share =1500
So 515*x=1500
So total money =4500
So P's share is 900 and R's share is 2100
So the difference is 1200