In finding the HCF of two numbers by division method, the quotients are 1, 8 and 2 respectively, and the last divisor is 105. What is the sum of the numbers?

3885 3780 3570 3675

3780

The two numbers are a and b c = 105 × 2 = 210 b = 210 × 8 + 105 = 1785 a = 1785 × 1 + 210 = 1995 a + b = 1785 + 1995 = 3780