156
12
84
84
lcd(2, 6, 12) = 12.
LCD(12, 20) = 60
LCD(12, 8) = 24.
If that's 5/12, 10/13 and 7/9, the LCD is 468.
LCD(7,9,13) = 7*9*13 which is 819
LCD(13, 16) = 208
Because the answer is 13/12 and the LCD of 6 and 4 is 12: Hence: 10/12+3/12 = 13/12.
LCD of 23 and 12 is 276.
LCD(12, 9) = 36