A,B and C can finish a job working alone in 72,24 and 36 days respectively. In how many days they can finish the job if they worked together?
12
15
9
18
A
12
B
18
C
9
D
15
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Solution
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Let the total work be 72 units (LCM on 72,24 and 36).
A,B and C′s one day work is 1,3 and 2 units respectively.
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