There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers.
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It is 15.
least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30
15
The LCD for 1/5 and 4/15 is 15.
Least common denominator is used for fractions, not integers. Integers can be expressed as fractions, though, by placing them over 1 so if you really meant least common denominator then the answer is 1. If, however, you meant least common multiple, then then answer is 60.