A tank containing water started to leak. Did the tank contain more than 30 gallons of water when it started to leak? (Note: 1 gallon = 128 ounces)

(1) The water leaked from the tank at a constant rate of 6.4 ounces per minute.

(2) The tank became empty less than 12 hours after it started to leak.


Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

考题讲解

题目分析:

(1)    只有漏水的速率,不知道水漏空的时间,也就不能确定开始漏水时含有多少水。条件1不满足要求。

(2)    只有漏水的时间,没有漏水的速率,也就不能确定开始漏水时含有多少水。条件2不满足要求。

结合条件1和条件2,每分钟漏水6.4盎司,不到12小时,也就是不到720分钟就漏空了,判断是否含有超过30*128=3840盎司的水。例如每分钟漏水6.4盎司,漏100分钟,满足条件1和条件2,则开始时只有640盎司的水,不足3840盎司。又如每分钟漏水6.4盎司,漏700分钟,满足条件1和条件2,则开始时只有6.4*700=4480盎司的水,超过3840盎司。因此,根据条件1和条件2也无法判断开始时是否有超过30加仑的水。

因此,本题答案为(E),两个条件结合起来也不能解题,必须提供新数据。

 

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