If 12 men and 6 boys can do a work in 4 days and 4 men and 14 boys can do the same work in 8 days, find the ratio of efficiency of a man to that of a boy.

1
2 ∶ 11
2
2 ∶ 5
3
3 ∶ 7
4
11 ∶ 2

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