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A, B and C can complete a work in 10, 12...

A, B and C can complete a work in 10, 12 and 15 days respectively. They started the work together. But A left the work 5 days before its completion. B also left the work 2 days after A left. In how many days was the work completed?
a.`4`
b. `15`
c. `7`
d. `8`

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