lionsshare wrote:
i) x - 4 = z
ii) y - x = 8
iii) 8 - z = t
For the system of equations given, what is the value of z?
(1) x = 7
(2) t = 5
Target question: What is the value of z?
Statement 1: x = 7
Scanning the three given equations, we see that equation i is all we need to determine the value of z
i) x - 4 = z
Replace x with 7 to get: 7 - 4 = z
So,
z = 3
Since we can answer the
target question with certainty, statement 1 is SUFFICIENT
Statement 2: t = 5
Scanning the three given equations, we see that equation iii is all we need to determine the value of z
iii) 8 - z = t
Replace t with 5 to get: 8 - z = 5
So,
z = 3
Since we can answer the
target question with certainty, statement 2 is SUFFICIENT
Answer:
D
Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
