单选题 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、 (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．

【正确答案】 B

【答案解析】[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。