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



28 people can do a job in 7 days. How many days would it take if there were only 4 people?



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



45 people can do a job in 7 days. How many days would it take if there were only 9 people?



28 people can do a job in 8 days. How many days would it take if there were only 7 people?

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



63 people can do a job in 7 days. How many days would it take if there were only 9 people?



9 명의 일꾼들이 어떤일을 끝내는데 5 일이 걸린다. 만일 3 명의 일꾼들이 하면 며칠 걸려 끝내겠는가?



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



49 people can do a job in 6 days. How many days would it take if there were only 7 people?

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