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A can do 40% of a work in 12 days, where...

A can do 40% of a work in 12 days, whereas B can do 60% of the same work in 15 days. Both work together for 10 days. C completes the remaining work alone in 4 days. A, B and C together will complete 28% of the same work in :

A

3 days

B

2 days

C

`1 1/2` days

D

`2 1/2` days

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