388  WorkRate1
2

Name : _________________

refresh

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?



40 people can do a job in 10 days. How many days would it take if there were only 8 people?



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

21 people can do a job in 11 days. How many days would it take if there were only 7 people?



48 people can do a job in 12 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?



42 people can do a job in 9 days. How many days would it take if there were only 6 people?

+(         )

(         )+

++[[          ]]++