The lowest common denominator of any set of whole numbers is 1
The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.
The answer is 20.
The lowest common denominator of any two positive numbers is always 1.
80
20 is the lowest common denominator for 4 and 10.
60 is the lowest common multiple of 20 and 15.
20
The least common denominator (LCD) is 1.
20
LCD(4, 5) = 20.
60
20, although if you reduced 15/20 to 3/4, the common denominator would be 4.