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题库 / Prep2007E2-DS-151
Is the average (arithmetic mean) of 5 different positive integers at least 30 ?
(1) Each of the integers is a multiple of 10.
(2) The sum of the 5 integers is 160.
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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is a multiple of ten means the number should be at least 10. the minimum value of the set should be 10,20,30,40,50. 我把数列弄成了0，10，20，30，40 。 但是0不能作为10的倍数，换句话说，0不能作为被除数。
0 可以作为被除数，不能作为除数。关键在于题目要求是正整数，而 0 不是正整数~
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