There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. If those numbers are denominators, the LCD is 15.
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The Least Common Multiple of 3 and 5 is 15, which would be the denominator to use for fractions with the denominators 3 and 5.
Sir/Ma'am, denominator are fractions, so the is no common denominator. But the least common multiples is 30
The least common denominator of the fractions 3/5 and 5/12 is 60.
A common denominator, though not the least one, is 120.
105