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19 Jul 2016, 08:56
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
92% (00:52) correct
8%
(01:09)
wrong
based on 2534
sessions
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Time
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Not Attempted Yet
In the figure above, what is the value of z?
1) x = y = 1
2) w = 2
Attachment:
OG2017_DS237.png [ 167.88 KiB | Viewed 41398 times ]
Attachment:
DS04594_f001.jpg [ 4.75 KiB | Viewed 33538 times ]
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19 Jul 2016, 09:14
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walker
Stat 1: X = Y = 1 , from the figure we can understand that all sides are equal and it is square. Z = 1 + A .. we are not sure of A ( A is the bottom line in right angled triangle)...Insufficient.
Stat 2: W = 2... We are not sure the about atleast the other side of the right angled triangle to know the value of A...Insufficient.
Stats 1 + 2 = \(1^2\) + \(A^2\) = \(2^2\) ... we can get the value of A... both sufficient to get the value of Z.
Hence C is correct answer..
Updated on: 13 Mar 2018, 11:31
Originally posted by BrentGMATPrepNow on 19 Jul 2016, 11:46.
Last edited by BrentGMATPrepNow on 13 Mar 2018, 11:31, edited 1 time in total.
Last edited by BrentGMATPrepNow on 13 Mar 2018, 11:31, edited 1 time in total.
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walker
IMPORTANT: For geometry Data Sufficiency questions, we are typically checking to see whether the statements "lock" a particular angle, length, or shape into having just one possible measurement. This concept is discussed in much greater detail in the video at the bottom of the page.
Target question: What is the value of z?
Statement 1: x = y = 1
This statement locks a few lengths into place. However, if we MENTALLY grab the bottom right vertex, we can pull it right to left, without affecting the fact that x = y = 1.
This means that we can alter the length of bottom side, which means we can alter the value of z
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: w = 2
This statement locks the hypotenuse into place. However, if we MENTALLY grab the left-most side (with length x), we can move that side right and left, without affecting the fact that w = 2
This means that we can alter the length of bottom side, which means we can alter the value of z
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
Knowing that x = 1 and w = 2 means we can use the Pythagorean Theorem to find the length of the bottom side of the right triangle.
Once we know the length of the bottom side of the right triangle, we can add it to 1 to get the length of bottom side, which means we can definitely determine the value of z
Since we can answer the target question with certainty, the combined statements are SUFFICIENT
Answer = C
Cheers,
Brent
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