The LCM of both numbers is 60
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It is: 1
The first number they both go into is 60. (Lowest Common Multiple = 60 = 12 X 5 & 15 X 4).
5 can go into 60 12 times. (5 x 12 = 60) (60/5 = 12)
60/12 = 5 times. 60/12 = 5 times. 60/12 = 5 times. 60/12 = 5 times.
12