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22 Mar 2021, 14:39
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D
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:
90% (01:28) correct
10%
(01:36)
wrong
based on 159
sessions
History
Date
Time
Result
Not Attempted Yet
On a certain quiz with 25 questions, each correct answer is scored 4 points and each incorrect answer is scored –1 point. Questions not answered receive no points. A student who answered 23 questions and had a total score of 82 points answered how many questions correctly?
A - 18
B - 19
C - 20
D - 21
E - 22
SOURCE: GMAT PREP Exam 5 & 6
A - 18
B - 19
C - 20
D - 21
E - 22
SOURCE: GMAT PREP Exam 5 & 6
22 Mar 2021, 14:44
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If correct: +4
If incorrect: -1
If no answer: 0 points
Since 23 questions have been answered, we can have either +4 or -1 points, forget the 0 points.
Now try to plug the answers !
Let's start with B:
19*4=76 points
We need 6 more points, too low
Let's try D:
21*4=84
We have two more points than we need, let's try to see if the remaining answers (which have to give -1 point) can fix this
Since the student answered 23 questions and for now we only plugged 21 questions, we have 2 questions remaining, each giving -1 points.
Therefore 84 - 2 = 82 points ! It works and we have the good number of questions replied (23)
I hope it helps !
If incorrect: -1
If no answer: 0 points
Since 23 questions have been answered, we can have either +4 or -1 points, forget the 0 points.
Now try to plug the answers !
Let's start with B:
19*4=76 points
We need 6 more points, too low
Let's try D:
21*4=84
We have two more points than we need, let's try to see if the remaining answers (which have to give -1 point) can fix this
Since the student answered 23 questions and for now we only plugged 21 questions, we have 2 questions remaining, each giving -1 points.
Therefore 84 - 2 = 82 points ! It works and we have the good number of questions replied (23)
I hope it helps !
23 Mar 2021, 03:11
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total question 25 and marks for one right is 4, so total marks = 25*4= 100
-------------------------------
the student answered twenty-three questions in total out of twenty-five
let c be the number of correctly answer quest. and (23-c) will become the number of incorrectly answered question. Given, (s)he scored 82.
4(c)+ -1(23-c) =82
4c -23 + c = 82
5c= 105
c= 21
-------------------------------
the student answered twenty-three questions in total out of twenty-five
let c be the number of correctly answer quest. and (23-c) will become the number of incorrectly answered question. Given, (s)he scored 82.
4(c)+ -1(23-c) =82
4c -23 + c = 82
5c= 105
c= 21
