Question 635716
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Hi,
Let C does 1 work in x days, then
 C = 1/x, B = 1/3x, A = 1/6x
 Total work = 1
 or, 12(1/x + 1/3x + 1/6x) = 1
prefer to think of it in this manner: work/day
 (1/x + 1/3x + 1/6x) = 1/12    |Multiplying thru by 12x so as all denominators = 1
 12 + 4 + 2 = x
 Or, x = 18
 So, C = 18 days, B = 54 days, C = 108 days   Yes. Good Work.