The lowest common denominator of 9, 25, and 49 is 11025.
LCD(6, 14) = 42
LCD(9, 3) = 9
LCD(25, 20, 4) = 100.
LCD(9, 21) = 63
The LCD of 20 and 9 is 180.
LCD(9, 15) = 45
LCD(9, 36) = 36.
lcd(9, 6) = 18.
the LCD of 2, 9 and 5 = 90
LCD(5, 7, 25) = 175
LCD(12, 9) = 36