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A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A

A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in :
a. 1523 days
b. 24 days
c. 30 days
d. 40 days

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