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In an 25-question test, scores are computed by subtracting 1/4 of the
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08 Feb 2022, 07:15
08 Feb 2022, 07:15
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In a 25-question test, scores are computed by subtracting 1/4 of the number of incorrect answers from the number of correct answers. If a student answered every question and scored a 10, how many did he answer incorrectly?
(A) 8
(B) 10
(C) 11
(D) 12
(E) 13
(A) 8
(B) 10
(C) 11
(D) 12
(E) 13
Re: In an 25-question test, scores are computed by subtracting 1/4 of the
[#permalink]
08 Feb 2022, 08:25
08 Feb 2022, 08:25
1
Total \(25\) questions
Let's say total \(x\) questions get correct.
Marks achieved = \(x - \frac{25-x}{4} = 10\)
\(4x - 25 + x = 40\)
\(5x = 65\)
\(x = 13\)
Incorrect answers \(= 25 - 13 = 12\)
Answer D
Let's say total \(x\) questions get correct.
Marks achieved = \(x - \frac{25-x}{4} = 10\)
\(4x - 25 + x = 40\)
\(5x = 65\)
\(x = 13\)
Incorrect answers \(= 25 - 13 = 12\)
Answer D
gmatclubot
Re: In an 25-question test, scores are computed by subtracting 1/4 of the [#permalink]
08 Feb 2022, 08:25
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