2. 外语
  3. 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 mak

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 mak

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问题 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 at the second stop?
选项 A、5
B、10
C、15
D、20
E、30
答案E
解析 某辆校车有两排座椅，每一排有10个双人座，每个双人座上可坐两个学生。若一辆空汽车开出并在途中停了两次，第二次停车时上车的学生人数是第一次停车时上车的学生人数的3倍，并且汽车在第二次停车后满载，问第二次停车时有多少个学生上车?
解：本题的正确答案是(E)。设第二次停车时有x人上车，则x+ x/3 = 10×2×2 → x=30
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