Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?
(1) She bought $4.40 worth ofstamps.
(2) She bought an equal numberof $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 statements TOGETHER are sufficient,but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOTsufficient.
参考答案：A
题目翻译：只买了15cents和29cents的邮票，问她买了多少15的?
题目全解：第一个条件可写出等式：4.4=0.15x+0.29y 则有 44=1.5x+2.9y
要想加起来的和为整数，则y只可能为10，所以x也确定只可能为10
第二个条件IN。
DS：What is the value of|x| ?
(1) x=-|x|
(2) x^2 = 4
答案：B
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