Because 240 is the smallest number that 12, 16 and 20 will divide into evenly with no remainder.
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12 is a factor of 24 so you need only consider the LCM of 20 and 24.20 = 4*5 24 = 4*6 So the LCM is 4*5*6 = 120.
The LCM of 4 and 20 is 20
LCM(4, 5) = 20.
24 - 4 = 20
12 3x4=12 4x3=12 12x1=12