'Pawan' and 'Qureshi' invested 9,000 and 12,000 rupees, respectively, to establish their businesses. 6 months later, 'Pawan' invests 'b' more money, and 'Raju' joins them with Rs.15,000. If 'Pawan's' profit share is (1/3)rd of the total profit received at the end of the year, find the value of '5b'.