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Last Updated on May 16, 2022
GMAT OFFICIAL GUIDE DS
Solution:
We are given 3 equations:
1) x – 4 = z
2) y – x = 8
3) 8 – z = t
We need to determine the value of z.
Statement One Alone:
x = 7
We see that we can substitute 7 for x in the first equation and then determine the value of z.
x – 4 = z
7 – 4 = z
3 = z
Statement one alone is sufficient to answer the question. We can eliminate answer choices B, C, and E.
Statement Two Alone:
t = 5
We see that we can substitute 5 for t in equation 3 and then determine the value of z.
8 – z = t
8 – z = 5
3 = z
Statement two alone is sufficient to answer the question.
Answer: D
