If 12 men and 16 boys can do a piece of work in 5 days; 13 men and 24 boys can do it in 4 days, then the ratio of the daily work done by a man to that of a boy is:

1
4 : 1
2
3 : 1
3
1 : 1
4
2 : 1
5
1 : 2

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