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题库 / Prep2007E2-DS-70
If eleven consecutive integers are listed from least to greatest, what is the average (arithmetic mean) of the eleven integers?
(1) The average of the first nine integers is 7.
(2) The average of the last nine integers is 9.
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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