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Practical questions are urgent! (14 16:58:9) It is known that a project can 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 required for team B to complete the project alone is 1.5 times that for team a to complete the project alone, and the daily 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 the project management department decides to select one of the two teams to complete the project independently, which team should be selected in order to save money? Please explain the reason
1. The completion time of team a is x days, and that of team B is 1.5x days
1/x+1/1.5x=1/12
We get x = 20,1.5x = 1.5 * 20 = 30 days
A 20 days, B 30 days
2. Let a be 150 + y yuan per day and B be y yuan per day
12（150+y)+12y=13800
Y = 500, y + 150 = 500 + 150 = 650
Cost of Party A: 650 * 20 = 13000 yuan
B: 30 * 500 = 15000 yuan
So it's cheap and fast to choose team a
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