Some problems about fractional equation in mathematics of grade two I'll take the math exam in the afternoon, 1. In the construction of new socialist countryside, a town decided to reconstruct a section of highway. It is known that the project will take 40 days to be completed by project team a alone. If project team B does it alone for 10 days, it will take 40 days to complete, Then the rest of the project will take 20 days for the two teams to complete. (1) the number of days required for team B to complete the project alone. (2) the number of days required for the two teams to complete the project together 2. It is known that a certain project will be completed within 12 days by the cooperation of team a and team B, and the total cost of the project is 13800 yuan. The time for team B to complete the project alone is 10 days less than the time for team a to complete the project alone, In addition, the daily project cost of team a is 150 yuan more than that of team B. (1) how many days does it take for team a and team B to complete the project separately? (2) if it takes 20 days and 30 days for team a and team B to complete the project separately, the project management department decides to choose one of the two teams to complete the project separately. From the perspective of saving funds, which team should be chosen and the reasons should be explained 3. For a section of Expressway under construction, the cooperation of Party A and Party B can be completed in 24 days, which costs 1.2 million yuan; if Party A works alone for 20 days, the rest of the project will be completed by Party B in 40 days, which costs 1.1 million yuan, How many ten thousand yuan each Answer person on the first floor: why do I think your first question seems to be wrong

Some problems about fractional equation in mathematics of grade two I'll take the math exam in the afternoon, 1. In the construction of new socialist countryside, a town decided to reconstruct a section of highway. It is known that the project will take 40 days to be completed by project team a alone. If project team B does it alone for 10 days, it will take 40 days to complete, Then the rest of the project will take 20 days for the two teams to complete. (1) the number of days required for team B to complete the project alone. (2) the number of days required for the two teams to complete the project together 2. It is known that a certain project will be completed within 12 days by the cooperation of team a and team B, and the total cost of the project is 13800 yuan. The time for team B to complete the project alone is 10 days less than the time for team a to complete the project alone, In addition, the daily project cost of team a is 150 yuan more than that of team B. (1) how many days does it take for team a and team B to complete the project separately? (2) if it takes 20 days and 30 days for team a and team B to complete the project separately, the project management department decides to choose one of the two teams to complete the project separately. From the perspective of saving funds, which team should be chosen and the reasons should be explained 3. For a section of Expressway under construction, the cooperation of Party A and Party B can be completed in 24 days, which costs 1.2 million yuan; if Party A works alone for 20 days, the rest of the project will be completed by Party B in 40 days, which costs 1.1 million yuan, How many ten thousand yuan each Answer person on the first floor: why do I think your first question seems to be wrong

1. (1) suppose that team B needs X days to complete it alone. If 20 / 40 + 30 / x = 1, then x = 60 (2) 1 / (1 / 40 + 1 / 60) = 24 (days) 2. Suppose that team a needs X days to complete it alone and team B needs y days to complete it alone, then (1 / x + 1 / y) * 12 = 13X / 2 = y. if x = 20 and y = 30, the two teams will get 13800 / 12 = 1150 yuan per day. If Party A needs 150 yuan more than Party B, then Party A will get 650 yuan