If ninety percent of the expected number of managers attended a conference, how many managers attended the conference?
(1) No more than ninety percent of all managers were expected to attend the conference
(2) 7 managers did not attend the conference
Source: Master Gmat 18 Q in sample test
From statement 1
Let total no. of managers be x.
a maximum of 0.9x managers were expected to attend.
at max, 0.9(0.9x) managers attended.
From statement 2
We do not know the number of managers expected to attend. Unable to derive any concrete values with given info.
Statement 1 + 2
We are not sure how many percent of total managers attended the conference. It can be anywhere between 0% to 90%.
As such, knowing the number of managers who did not attend is insufficient for us to derive answer.
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