1. If it takes X days for Team B to complete this project alone, then the work efficiency of Party A is:1/40; The work efficiency of Party B is:1/x; The workload of Party B before 10 days is: 10 * (65438). 1/40+ 1/X the workload of two teams working together for 20 days: the working efficiency of cooperation multiplied by the working hours, that is, (1/40+ 1/X)*20, Therefore, the equation should be: the workload of Party B for 10 days+the workload of Party A and Party B for 20 days = the total workload (that is, the unit is 1) 652. If there are X people in Class B, then there are X+2 people in Class A, and everyone in Class A has donated Y yuan, then the equation of 0.8Y yuan per person in Class B is X × 0.8Y = 232.