it equals 2 stupid
LCD = 24 so we have 21/24 + 20/24 = 41/24 = 1 and 17/24ths
LCD(2, 24) = 24
LCD(9, 21) = 63
LCD(18, 21) = 126
LCD(2,6,8,24) = 24
1/3 and 3/8 have a lcd of 24 (8/24 and 9/24)
24
LCD(21, 13, 14, 15) = 2730
LCD is 24
LCD(8, 3) = 24.
LCD(6, 8) = 24
LCD(12, 8) = 24.