What is the average of $x$ and $y$? Statement I: $x+y=30$. Statement II: $x-y=4$. Choose the standard data-sufficiency option.
Practice this question from Chapter Mock 16: Data Sufficiency, with options and an explanation.
Question
What is the average of $x$ and $y$?
Statement I: $x+y=30$.
Statement II: $x-y=4$.
Choose the standard data-sufficiency option.
Option A — Correct answer
A
Correct choice.
Option B
B
Option C
C
Option D
D
Option E
E
Explanation
Statement I alone is sufficient because average $=\frac{x+y}{2}=15$. Statement II alone is insufficient because it does not give the sum. So the answer is A.