447  WorkRate1
2

Name : _________________

refresh

20 people can do a job in 11 days. How many days would it take if there were only 4 people?



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



24 people can do a job in 8 days. How many days would it take if there were only 6 people?



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



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

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



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



45 명의 일꾼들이 어떤일을 끝내는데 8 일이 걸린다. 만일 9 명의 일꾼들이 하면 며칠 걸려 끝내겠는가?



8 people can do a job in 10 days. How many days would it take if there were only 2 people?



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

+(         )

(         )+

++[[          ]]++