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25 Sep 2019, 01:24
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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:
35%
(medium)
Question Stats:
79% (02:41) correct
21%
(03:13)
wrong
based on 156
sessions
History
Date
Time
Result
Not Attempted Yet
[GMAT math practice question]
\(50\) students took a quiz with two questions \(A, B\) and each question has \(10\) points. \(35\) students solved question \(A\) correctly and \(20\) students solve both questions correctly. If the total average is \(13\) points, then how many students solved only question \(B\) correctly?
\(A. 4\)
\(B. 6\)
\(C. 8\)
\(D. 10\)
\(E. 12\)
\(50\) students took a quiz with two questions \(A, B\) and each question has \(10\) points. \(35\) students solved question \(A\) correctly and \(20\) students solve both questions correctly. If the total average is \(13\) points, then how many students solved only question \(B\) correctly?
\(A. 4\)
\(B. 6\)
\(C. 8\)
\(D. 10\)
\(E. 12\)
25 Sep 2019, 11:39
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Bookmarks
20 people * 20 points ( both done correctly) ====== 400
( 35- 20 people ) i.e 15 people only A ========== 150
Cumultive of both correct and A only correct ===== 500.
Class avge 13 and class absolute total is 50* 13 ==== 650
Total of B alons ==100 and divided by the points 10 per question, the answer is 10 people . Answer is D.
( 35- 20 people ) i.e 15 people only A ========== 150
Cumultive of both correct and A only correct ===== 500.
Class avge 13 and class absolute total is 50* 13 ==== 650
Total of B alons ==100 and divided by the points 10 per question, the answer is 10 people . Answer is D.
27 Sep 2019, 00:10
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points on question A and B = 10 each
student solved A correctly = 35
students solved both correctly = 20
total students = 50
average point of 50 students = 13
D is the answer
student solved A correctly = 35
students solved both correctly = 20
total students = 50
average point of 50 students = 13
D is the answer
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