60
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The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.
300
LCD(8, 20, 15) = 120
The is no "largest" common denominator. For any denominator you find, we can multiply it by a natural number and come up with a larger one. Do you mean LEAST COMMON DENOMINATOR?
A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.