LCD(20, 28) = 140
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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions.
The Least Common Multiple of 28, 35, 20 is: 140
84/14 = 6 84/7 = 12 84/3 = 28 Hence 84 is the least common denominator
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions. Even if you converted your numbers (x) to their fraction equivalents (x/1), the LCD will always be 1.