571 x 320 = 182720729 x 320 = 233280
182720 + 233280 - 7539 = 402461
Therefore, 571x320 + 729x320 - 7539 = 402461.
571 x 320 = 182720
729 x 320 = 233280
182720 + 233280 - 7539 = 402461
Therefore, 571x320 + 729x320 - 7539 = 402461.