THE CORRECT ANSWER IS (C). YOU CAN DETERMINE THE AVERAGE OF A, B,...
18. The correct answer is (C). You can determine the average of a, b, and c if you know
their sum. Statement (1) alone tells you that the sum of a and b is 10, but it provides no
information to help you determine the value of c. Statement (2) alone tells you nothing
about the value of either a or b, but it provides the value of c. Together, the two
statements allow you to determine the sum of the three terms (10
1
9) and in turn their
mean:
10
1
9
3
5
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