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40 points for 3 parts processed by Party A and 30 points for 4 parts processed by Party B. the work efficiency ratio of Party A and Party B is () A. 3：4B. 4：3C. 9：16D. 16：9
The work efficiency of a is: 3 △ 40 = 340, the work efficiency of B is: 4 △ 30 = 430, the work efficiency ratio of a and B is: 340:430 = 9:16, so choose: C
Party A and Party B process a batch of parts together, and complete the task after 4 hours. If Party A processes this batch of parts separately, it will take 7 hours, and Party B processes 60 parts per hour
Q: how many parts are there in this batch?
Set a to process x parts per hour
The equation (x + 60) * 4 = 7 * x can be listed
The solution is x = 80
So there are 80 + 60 = 140 parts
Take it if you feel good
RELATED INFORMATIONS
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- 14. A project takes six days for Party A to complete and four days for Party B. what is the efficiency ratio between Party A and Party B?
- 15. For a project, it takes 8 days for team a to do it alone, and 10 days for team B to do it alone______ ．
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