I agree with E, and would also add that even if we knew the number of expected managers, it's still possible that some unexpected managers showed up. It's pretty clear that 1 and 2 are insufficient by themselves. If you knew the total number of managers, T, then the number who came would just be T-7, from statement 2. For both statements, if you can't see it for sure, to prove insufficiency, show that at least two T values are possible with both statements true:
T=100
50 expected, 50 unexpected (satisfies statement 1)
45 expected managers attended, 5 didn't (satisfies given-90% of expected attended)
48 unexpected managers attended, 2 didn't (satisfies statement 2)
overall, 93 managers attended
T=80
40 expected, 40 unexpected (satisfies statement 1)
36 expected managers attended, 4 didn't ( satisfies given-90% of expected attended)
37 unexpected managers attended, 3 didn't (satisfies statement 2)
overall, 73 managers attended
shankar.ashwin wrote:
P.S: Could someone clarify if we could take it as exactly 90% of all managers for no more than 90%?
Yes, no more than 90 implies that the percentage is less than
or equal to 90.
