Answer:
(2 + 5)
Explanation:
First, calculate the sum of 18+45. This is 63.
Then, calculate all sums.
3 + 9 = 12
5 + 2 = 7
1 + 3 = 4
9 + 9 = 18
63/ 12 = 5.25
63/7 = 9
63/4 = 15.75
63/18 = 3.5
63/7 results in a positive integer, 9. All other values result in positive integers with decimals. Therefore, the sum of 5 + 2 has a multiple of the sum of 18 +45.