147  WorkRate
Together, how long? 2

Name : _________________

  

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If Ann does a job in 10 days, and Bob does it in 7 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 9 days, and Bob does it in 4 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 6 days, and Bob does it in 6 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 4 days, and Bob does it in 4 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 10 days, and Bob does it in 6 days, how long do they take together? (Nearest to the 10th...)

If Ann does a job in 5 days, and Bob does it in 8 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 2 days, and Bob does it in 7 days, how long do they take together? (Nearest to the 10th...)



어떤일을 영철이 혼자 하면 7일 걸리고, 나혼자 하면 7일 걸리는데, 같이 일하면 며칠이 걸리는가? (소수점 이하 한자리...)



If Ann does a job in 5 days, and Bob does it in 5 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 3 days, and Bob does it in 7 days, how long do they take together? (Nearest to the 10th...)

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147    4.1 2.8 3 2 3.8 ( 15.7 )   3.1 1.6 3.5 2.5 2.1 ( 12.8 )   [[ 28.5 ]]