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题库 / GMATLA-DS-12
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.
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.
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邮票的张数只能是正整数n。(1)0.15x+0.29y=4.4,确定x/y是否有一个以上的组合，用个位数为0来试。5的倍数为0或5，9的倍数为0～9，当x为5，y为，5或x为10，y为10时，0.15x+0.29y的尾数为0.试出来两个都为10时等式(1)成立。
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