63
20
The LCDis36.
12 is.
20 is.
The least common denominator for 4 5 and 11 is 1.
12 is.
20 is.
20
The LCDis36.
The least common denominator for 4 5 and 11 is 1.
56
80
12
The least common denominator is 340.
The LCD of 3/4 and 4/5 is 20.
The word "common" indicates that there will be at least two. You have one. Your answer will be some multiple of 4.
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.