Bunuel 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 = 3Since 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 = 3Since we can answer the

target question with certainty, statement 2 is SUFFICIENT

Answer: D

Cheers,

Brent

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Brent Hanneson – Founder of gmatprepnow.com