GMAT备考，除了背背背，更重要的就是练练练！通过练习，巩固知识，熟练技巧，最终才能在GMAT考试中发挥出色，取得好成绩，所以练习的重要性不言而喻。因此，小编为大家精心准备了GMAT考试各类题型的练习题和答案解析，帮助大家每日一练，为考试做好准备。一起来看今天的题目。
今日练习题为数学题，题目如下
Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?
(1) She bought $4.40 worth of stamps.
(2) She bought an equal number of $0.15 stamps and $0.29 stamps.
A Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D EACH statement ALONE is sufficient.
E Statements (1) and (2) TOGETHER are NOT sufficient.
正确答案：
A
题目分析：
Joanna只买了0.15和0.29两种价值的邮票，问她买了多少枚0.15的邮票?
单独看条件1：总共买了价值4.4的邮票。这道题隐含着一个条件：邮票数是正整数。因为4.4分成正整数的0.29与0.15组合只有一种情况，也就是各买了10枚。所以是唯一解，条件1自己就可以满足。
单独看条件2：两种邮票买了一样的数量。没有总价，没有上限，无法从条件2单独得出结果。所以条件2 not sufficient.
根据以上结论，得出答案为A。
