Răspuns :
Aplici regula de 3 simpla.
20 m .......... 15 zile
15 m .......... (15*15)/20=225/20;
20 m .......... 15 zile
15 m .......... (15*15)/20=225/20;
20 muncitori........1sant..........15 zile
1 muncitor...........1 sant........300 zile
15 muncittori........1 sant.........300:15=20 zile
1 muncitor...........1 sant........300 zile
15 muncittori........1 sant.........300:15=20 zile