The hcf of 15 and 20 is 5
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Both 15 and 20 can go into 60, as they are both factors of that number.
The only common factor of 15, 20 and 24 is 1.
15/5=3 100/5=20
The GCF of 15 and 20 is 5
Oh, dude, that's like basic math. So, what goes into both 7 and 20 is 1, because every number can be divided by 1. Also, 7 goes into 7 once, and 20 goes into 20 once too. So, yeah, it's just 1.