The second grade of junior high school In order to improve the situation, the municipal company decided to contract the drainage project of a section of the road to Party A and Party B. the cooperation between Party A and Party B will take 12 days to complete; if Party A completes the project alone, it will take 20 days, Each construction day of Party B needs 10000 yuan, and the cost of completing the project does not exceed 350000 yuan, so how many days does the construction team of Party B need at least? ------------------------------Suppose, formula and final answer------------------------------

(1) It takes X days (1 / x) + (1 / 20) = 1 / 12x = 30 for Party B to complete the project alone. A: it takes 30 days for Party B to complete the project alone. B: it takes y days for Party A to construct, and Z days (Y / 20) + (Z / 30) = 12Y + Z ≤ 353y + 2Z = 603y = 60-2z2y = 40 - (4 / 3) Z40 - (4 / 3) Z + Z ≤ 35 - (1 / 3) Z ≤ - 5x ≥ 15

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