The greatest common divisor of two natural numbers is 18, and the least common multiple is 108,

The greatest common divisor of two natural numbers is 18, and the least common multiple is 108,

Let two numbers be a and B respectively, a = greatest common divisor * C, B = greatest common divisor * D, and C and D are coprime. The least common multiple = greatest common divisor * c * D. so c * d = 108 / 18 = 6 = 2 * 3, that is, C and D are 2 and 3, so the two numbers are 18 * 2 = 36, 18 * 3 = 54, and the sum of two numbers is 36 + 54 = 90