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题库 / GMATAdvanced-DS-19
In a certain group of people, the average (arithmetic mean) weight of the males is 180 pounds and of the females, 120 pounds. What is the average weight of the people in the group?
(1)The group contains twice as many females as males.
(2)The group contains 10 more females than males.
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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要实际把算式给写出来：
平均值：(180m+120f)/m+f
A已知f=2m, 那么未知数就可以通过约分消除，即可算出整体的平均值