1 and 3
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The largest number that goes into both (the greatest common factor) is 4. 16/4=4 60/4=15
The LCM of 60 and 21 is 420
5 and 15 go into 60 & 75.
15 / 0.6 = 25 Therefore, 15 is 60 percent of 25.
4 goes into 60 15 times.