72
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The LCD of the given three numbers is 8
If that's 84 and 35, the LCD is 420.If that's 8/4 and 3/5, the LCD is 20.
LCD= Lowest Common Denominator=72
1/3 and 3/8 have a lcd of 24 (8/24 and 9/24)
If you mean lcm, it is 36 because 9 x 4 equals 36 and 3 x 12 equals 36.