题目

阅读理解 Kangkang's Timetable Mon. Tues. Wed. Thur. Fri. 8:00-8.45 Chinese Math English Chinese English 8:55-9:40 English Chinese Math English English 10:10-10:55 Math English Politics Music Math 11:05-11:50 Geography P.E Music Math Art 14:20-15:05 History Geography Chinese P.E Computer science 15:15-16:00 Biology Biology Chinese History Computer science 16:10-16:55 0utdoor activities Class meeting 0utdoor activities 0utdoor activities 0utdoor activities （1） How many English lesso15．已知甲乙两数比是4：5，甲数是18，乙数是22.5．