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The number in common is 5, because it divides both 5 and 15.
The Least Common Multiple (LCM) for 5 20 is 20.
Since 5 is a factor of 20, all the factors of 5 are common to 20.
The common factor of 2, 5 and 10 is 1.
The least common multuple of 5 and 9 is 45.