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A highway was originally planned to be completed by 120 people in 50 days, and 20 people were transferred after 30 days. The remaining people need to work a few more days than the original plan
[120*50-30*120]÷(120-20)+30-50=4
It was originally planned that 120 people would complete the construction of a section of highway in 50 days. After 30 days of work, 20 people were transferred to other sections to rush to repair. In this way, how many days will it take the remaining people to complete the task?
1 △ 120 × 50 = 16000 (1-16000 × 30 × 120) △ 16000 × (120 − 20)] = (1-35) △ 160 = 25 △ 160 = 24 (days) a: the rest of the people need 24 days to complete the task
2. To build a section of highway, 120 people were originally planned to finish in 50 days. After one month's work (calculated as 30 days), 20 people were transferred,
According to the data of 120 people and 50 days, we can get the assumption that the work quantity is 1, and then calculate the work efficiency of each person. The work efficiency of 120 people for 30 days, and then subtract the completed work from 1 to get the remaining work quantity, and then divide by the daily work efficiency (the work efficiency of each person multiplied by the total number of people 100) to get the time required for the remaining work, Plus the previous 30 days is the total time required for this project
To build a section of highway, 120 people were originally planned to finish in 50 days. After one month's work (calculated as 30 days), 20 people were transferred to rush to repair
What's your question? How long will it take to complete the highway after 20 people are transferred?
If so, then
The total workload is 1:1
The daily workload of each person is 1 / 120 * 50
After one month's work, the remaining workload is 1-30 / 50 = 0.4
The road still needs time = 0.4 / (1 / 120 * 50) / (120-20) = 24 days
To build a highway, 120 people were originally planned to finish the work in 50 days. After one month (calculated as 30 days), 20 people were transferred to repair other sections
How many more days will it take for the rest of us to finish the task
More dry: 120 × (50-30) / (120-20) - (50-30) = 4 days
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