Answer: 7
3 x 7 = 21
4 x 7 = 28.
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Oh, dude, 9 and 21 both go into numbers that are multiples of both 9 and 21. So, like, they can go into numbers like 63, 126, 189, and so on. It's just basic math, nothing too mind-blowing.
The numbers that go into 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84.
21
1 ,3 ,7 ,21