If x is a positive integer, what is the least common multiple of x, 6, and 9 ?
(1) The least common multiple of x and 6 is 30.
(2) The least common multiple of x and 9 is 45.
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.
由(1)可以得出 x=5 或 15,但是就算是这样 5,6,9 or 15,6,9 的最小公倍数都是90,所以单独可以;
由(2)可以得出 x=5 或 15,但是就算是这样 5,6,9 or 15,6,9 的最小公倍数都是90,所以单独可以;
这样其实还是有点漏洞,因为1)里面x还能=30 2)中x可以=45
应该是①里可以取5,10,15,30;②里可以取5,15,45.最后三者最小公倍数都是90
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