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The least common denominator (LCD) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least denominator for a number is itself.
the least common multiple of 15,9,and 12 is 180.
lowest common denominator of 4/5 and 7/15 would be 15 4/5=12/15
15
20, although if you reduced 15/20 to 3/4, the common denominator would be 4.