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Three pipes A, B, and C can fill a tank in 50 minutes, 60 minutes, and 75 minutes respectively. All are opened together. A is closed after 'n' minutes, and B is closed (2n - 6) minutes before the tank is filled. If the tank is filled in 40 minutes, find the value of 'n'.

A 14

B 20

C 18

D 6

E None of these

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