Solving two mathematical problems (solving linear equation with one variable) First: Party A and Party B want to jointly contract a project. Party A will complete the project within 30 days and Party B will complete the project within 20 days. The contract stipulates that the project will be completed within 15 days. Otherwise, a fine of 1000 yuan will be imposed for each day. Party A and Party B sign the contract after discussion (1) Under normal circumstances, can party A and Party B renew the contract? Why? (2) at present, 75% of the project is jointly carried out by Party A and Party B. because there is something urgent elsewhere, one person must be transferred. Who is more suitable to be transferred? Why? The second way: there is a home appliance store that increases the selling price of a refrigerator by 40% according to yuan, and then writes "big reward, 20% discount" in the front advertisement. After consumers complain, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the selling price of yuan per refrigerator The second question is like this: a household appliance store will increase the original price of a refrigerator by 40%, and then write "big reward, 20% discount" in the front advertisement. After consumer complaints, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the price of each ice box
(1) 1 / (1 / 30 + 1 / 20) = 12 can (2) a (1-75%) / (1 / 30) = 7.5 (days) B (1-75%) / (1 / 20) = 5 (days) total 75% / (1 / 30 + 1 / 20) = 9 (days) 9 + 7.5 = 16.5 (days) No 9 + 5 = 14 (days) can be adjusted a second (1 + 40%) x * 20% = 2700 / 10x = 675 / 7X is about 96.4 the second question may be wrong