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15 people can do a job in 12 days. How many days would it take if there were only 3 people?



21 people can do a job in 10 days. How many days would it take if there were only 3 people?



20 people can do a job in 9 days. How many days would it take if there were only 5 people?



36 people can do a job in 12 days. How many days would it take if there were only 9 people?



18 people can do a job in 12 days. How many days would it take if there were only 6 people?

21 people can do a job in 12 days. How many days would it take if there were only 7 people?



48 people can do a job in 11 days. How many days would it take if there were only 8 people?



4 명의 일꾼들이 어떤일을 끝내는데 9 일이 걸린다. 만일 2 명의 일꾼들이 하면 며칠 걸려 끝내겠는가?



20 people can do a job in 9 days. How many days would it take if there were only 4 people?



36 people can do a job in 11 days. How many days would it take if there were only 6 people?

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