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31 Jan 2017, 03:43
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
74% (01:22) correct
26%
(01:11)
wrong
based on 116
sessions
History
Date
Time
Result
Not Attempted Yet
If the GMATCLUB timer, which is absolutely correct, shows 20% correct answers, what can be the number of incorrect answers?
1) 4
2) 6
3) 14
4) 25
5) 30
Self made
1) 4
2) 6
3) 14
4) 25
5) 30
Self made
BillyZ
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Schools: Sloan '23 (D) Tuck '23 (D) Darden '23 (D) Ross '23 (D) Kellogg '23 (D) Wharton '23 (D) Booth '23 (D) Fuqua '24 (A) Harvard '24 (D) Stanford '24 (D)
GMAT 1: 750 Q51 V40 (Online)
Posts: 1,135
31 Jan 2017, 03:47
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A. 0.8 x = 4, x = 5. Others answer choice is not divisible by 0.8.
Sent from my iPhone using GMAT Club Forum mobile app
Sent from my iPhone using GMAT Club Forum mobile app
31 Jan 2017, 07:58
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chetan2u
Let C = # of correct responses
Let N = # of NOT correct (incorrect) responses
So, C+N = TOTAL # of responses
We're told that (# of correct responses)/(TOTAL # of responses) = 20%
In other words, (# of correct responses)/(TOTAL # of responses) = 1/5
So, C/(C + N) = 1/5
Cross multiply to get: 5C = 1(C + N)
Simplify: 5C = C + N
Subtract C from both sides: 4C = N
We can see that N is 4 TIMES the value of C
In other words, N is a multiple of 4
Check the answer choices....
Only answer choice A is a multiple of 4
Answer: A
