题目

Why does the man prefer magazines? A . They are cheaper. B . They are more interesting. C . They can be finished more quickly. 答案：C某中学计划购买A型和8型课桌凳共200套，经招标，购买一套A型课桌凳比购买一套B型课桌凳少用40元，且购买4套A型和5套B型课桌凳共需1820元．求购买一套A型课桌凳和一套B型课桌凳各需多少元．