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1. |
4 boys from school A and 6 boys from school B together can set up an exhibition in 5 days, which 5 boys from school A and 10 boys from school C together can do in 4 days or 3 boys from school B and 4 boys from school C together can do in 10 days. Then how many boys from school A can set up the exhibition in one day? |
A. | 20 |
B. | 60 |
C. | 40 |
D. | 80 |
Answer» D. 80 | |