10 and 120
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Since 120 is a multiple of itself, all you need to do is pair it with any other factor of 120. 120 and 60 have an LCM of 120.
30 and 40
240
HCF is the highest common factor of two or more numbers. One such pair which has 60 as their HCF can be: 120 and 180.
120 and 144