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The LCM of 5,15, and 20 is 60.

start with the multiples of 20 which are 20, 40, and 60.

15 does not go into 20 or 40 but it goes into 60.

now look at 5 which of course goes into 60 evenly.
Lcm

5=1*5

15=3*5

20=2*2*5

lcm=2*2*3*5=60
60

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8y ago

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