B & C can complete a task in 40 days while A, B & C

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B & C can complete a task in 40 days while A, B & C can complete the task in 20 days. In how many days can A complete the task alone?

[UP Police Constable Official Paper 2019 (Held on: 28 Jan 2019 Shift 1)]

A

20

B

25

C

30

D

40

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