You seem to have misunderstood the difference between HCF and LCM. Ask your teacher to go over it again.
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The Least Common Multiple (LCM) for 6 12 20 is 60.
The Least Common Multiple (LCM) for 12 20 is 60.
240
This cannot be answered because the common multiples of any two or more numbers are infinite.
The Least Common Multiple (LCM) for 5 20 is 20.