195
LCD(21, 13, 14, 15) = 2730
The LCD of 13, 14 and 15 is 2730 The LCD of 1/3, 1/4 and 1/5 is 60
195
165
free
195 If that's 1/3 and 1/5, the LCD is 15.
The LCD of 4/5 and 1/3 is 15.
LCD(9, 15) = 45
LCD(15, 26) = 390
LCD(7,9,13) = 7*9*13 which is 819
LCD(13, 16) = 208
LCD(15, 7, 8) = 840.