A school bus has 10 double seats in each of 2 rows. Two students can sit in each double seat. If an empty bus starts out and makes two stops, picking up three times the number of students at the second stop as at the first stop, and if the bus is then filled to seating capacity, how many students got on the bus as the second stop? A. 5 B. 10 C. 15 D. 20 E.30
答案是E 偶以为是B作者: dandeliontt 时间: 2011-7-26 23:35:04
应该是那个倍数关系没搞清楚，可以看看陈向东的书。
N times as much A as B / A is N times as much as B都是指A=NB~
所以本题three times the number of students at the second stop as at the first stop
是指第二站上来的是第一站上来的三倍。