There IS only one LCD. The word least is a superlative, which means there can be only one.
LCD(79, 90) = 7110
LCD(90, 72) = 360
the LCD of 2, 9 and 5 = 90
35
35% of 90:= 35% * 90= 0.35 * 90= 31.5
It is: 630
420
105
35
90
180
90
5 is a factor of 35, so the LCD is 35.