20
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1, 2, 4, 5, 8, 10, 16, 20, 40, 80
10 20 30 40 50 60 70 80 90 100.....
Well, honey, 4 goes into 8 and 12, while 5 goes into 10 and 15. So, technically, both 4 and 5 can go into numbers that are multiples of themselves. But really, it's basic math, darling.
LCM(4, 5, 7) = 140
prime numbers between 4 and 10: 5 & 7