问题
单项选择题
All of the tickets for two real estate seminars, F and G, were either purchased or given away, and the ratio of F tickets to G tickets was 2 to 1. Of the total number of F tickets and G tickets, what percentage was purchased ？（）
(1)The total number of F tickets and G tickets is 240.
(2)Of the F tickets, exactly 60 percent were purchased, and of the G tickets, exactly 80 percent were purchased.
A.条件（1）充分，但条件（2）不充分.
B.条件（2）充分，但条件（1）不充分.
C.条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分.
D.条件（1）充分，条件（2）也充分.
E.条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
答案
参考答案：B
解析：
根据(1)只能算出F票和G票分别有160张和80张，但无法求出他们总共有百分之多少的票被购买；设G票为x张，则F票为2x张，根据(2)可得F票和G票合在一起时被购买的百分比为
。
所以(2)充分。
