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268
23
The distinct prime factors of 550 are 2, 5 and 11. They add up to 18.
6, 12 and 18
527
268
23
18 and 3 are factors of 162.
-10 & -18
360
-20 and 2
The distinct prime factors of 550 are 2, 5 and 11. They add up to 18.
91
5298
First list the factors of each. For 18, that's 1, 2, 3, 6, 9, and 18. For 20, that's 1, 2, 4, 5, 10, and 20. From these, you could add all of the factors of 18 to get 39. Or you could add 20, 10, and 9. Or 20, 10, 5, and 4. Or . . . you get the idea.
815
-25