Am I Correct on this Math Problem?

Test Preparation SAT Preparation
1

<p>Hello, I just got this math problem from some random website that didn't have the correct answer listed, so I would like to know if somebody could figure this out and tell me if I'm right.
Here's the question: If the average of t and t+2 is x, and the average of t and t-2 is y, what is the average of x and y? A) 1 B) t/2 C) t D) t + 1/2 E) 2t</p>

<p>I got choice C as being the answer. Here is my work:
2t+2/2 = x, x = t+1
2t-2 = y, y = t-1
(t+1)+(t-1)/2, 2t/2 = t</p>

<p>Thankssssss</p>

2

<p>Yep, C. A lot easier if you just plug in numbers.</p>

<p>t = 3
(3+3+2)/2 = x, x = 4
(3+(3-2))/2 = y, y = 2
(4+2)/2 = 3 = t</p>

3

<p>Ok cool, thanks again.</p>

4

<p>If X is the avg of T and (T+2), X is T+1
If Y is the avg of T and (T-2), Y is T-1</p>

<p>Avg if (T+1) and (T-1) is T.</p>

5

<p>Same way as anhtimmy, just on the number line:
x is the midpoint between t and t+2
y is the midpoint between t and t-2
t is the midpoint between x and y, so
t is the answer.</p>