Person A lent an principal Rs.x at 8% per annum for 4 years for SI. He also lent Rs.1.5x at 15% per annum for 2 years, using compound interest. The interest earned from the compound interest investment is Rs. 1965 more than the interest earned from the simple interest investment. Additionally, an amount (1/3(x) + y)was lent at 20% per annum for 2 years and the compound interest earned is Rs.(y - 1600). Find the value of (x + y).