Quantitative Aptitude
Work and Time
A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in:
A  1/24 day 
B  7/24 days 
C  3 3/7 days 
D  4 days 
E  None of these

LCM = 24, let total work is 24 unit
A = 1 unit, B = 4 unit, C = 2 unit
All together do 7 units daily.
So they complete work in
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