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If 2 men and 7 boys do a piece of work i...

If 2 men and 7 boys do a piece of work in 14 days while 3 men and 8 boys do the same piece of work in 11 days, then in how many days will 8 men and 6 boys do thrice of that work?
(A) 11
(B) 21
(C) 31
(D) 41

A

C

B

B

C

A

D

D

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