60
The least commmon multiple is 60.
It is 60
60
60
The LCD of 3/20 and 7/30 is 60.
The least common denominator is 60.
The least common multiple of 12 and 30 is 60. 60/12=5 and 60/30=2.
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.
LCD(12, 20) = 60
60 I think
60.
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. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.