Quantity-I: ‘A’ and ‘B’ started a business by investing Rs. ‘x’ and Rs. 3,200, respectively. ‘A’ and ‘B’ invested their sum for 6 months and 9 months, respectively. If ratio of profit share of ‘A’ and ‘B’ is 1:2, respectively, then find the value of ‘x’? Quantity-II: If a:b = 4:3 and b = 1500, then find the value of ‘a’.