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Over (6 + 9 = 15) days, A did 3u of work.

B did ⅓ × 3u = 1u of work

C did twice of B → 2u of work

Total amount of work done by B and C → 3u

Total amount of work for the whole project → 3u + 3u = 6u

A will take 15 × 2 = 30 days to complete the project alone.

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