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18 Jun 2011, 04:23
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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:
35%
(medium)
Question Stats:
61% (00:59) correct
39%
(01:01)
wrong
based on 736
sessions
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How many integers are there between C and D?
(1) Neither c nor d is an integer.
(2) c – d = 3
(1) Neither c nor d is an integer.
(2) c – d = 3
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
18 Jun 2011, 04:47
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guygmat
I got the hint from statement 1 and chose C. If it was not written, perhaps I would have missed.
(2)
c=5.1, d=2.1; c-d=3; (3,4,5)-- 3 integers between them
c=5, d=2; c-d=3; (3,4)-- 2 integers between them
Insufficient.
(1)
Clearly insufficient.
c=1.1 d=1000000.1
c=1.1 d=1.1
Combining both;
c=5.1, d=2.1; c-d=3; (3,4,5)-- 3 integers between them
OR
c=55.00001, d=52.00001; c-d=3; (53,54,55)-- 3 integers between them
Always 3 integers.
Sufficient.
Ans: "C"
29 Jun 2011, 09:24
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The best way to answer these questions is to go through both statements individually and mark them as sufficient or insufficient. Then, only if both are marked as insufficient, you check if the two statements combined are sufficient.
Step 1: Statement 1 tells us neither C nor D is an integer.
This is clearly insufficient as it gives us no indication of how many integers are in between C and D.
Insufficient.
Step 2: Statement 2: C - D = 3.
If C and D were both integers (e.g. C = 4 and D = 7), there would be only 2 integers in between them while there would be 3 integers between C = 4.5 and D = 7.5.
Insufficient.
Step 3: Since both have been marked as insufficient, we now check them combined.
C - D = 3. C and D are not integers.
Sufficient.
Therefore the answer is C.
Step 1: Statement 1 tells us neither C nor D is an integer.
This is clearly insufficient as it gives us no indication of how many integers are in between C and D.
Insufficient.
Step 2: Statement 2: C - D = 3.
If C and D were both integers (e.g. C = 4 and D = 7), there would be only 2 integers in between them while there would be 3 integers between C = 4.5 and D = 7.5.
Insufficient.
Step 3: Since both have been marked as insufficient, we now check them combined.
C - D = 3. C and D are not integers.
Sufficient.
Therefore the answer is C.
