The numbers that go into 17 are 1 and 17, as 17 is a Prime number and only divisible by 1 and itself. The numbers that go into 20 are 1, 2, 4, 5, 10, and 20, as 20 is a composite number with multiple factors.
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17/20 is the simplest form. While 20 is a composite number, 17 is prime. Thus no numbers other than 17 (and 1) could be factored out and 17 does not go into 20.
1,2,3,4,5,6,10,12,15,20,30,60
43
28
The two numbers that add to get 17 and multiply to get 20 are 5 and 12. This is because 5 + 12 = 17 and 5 x 12 = 20. These two numbers satisfy both conditions simultaneously, making them the correct pair.