There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
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A common denominator, though not the least, is 1700.
If you mean Least Common Multiple; it is 50.
The least common denominator would be 50
The least common multiple of 20 , 25 , 30 = 300
The LCD of 7/10 and 18/25 is 50.