A school bus has 10 double seats in each of 2 rows

未知题型

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?
E.30

A.5
B.10
C.15
D.20

【参考答案】

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，......

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