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In an exam 62% of the students were declared as passed. However, due t

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In an exam 62% of the students were declared as passed. However, due t [#permalink]

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In an exam 62% of the students were declared as passed. However, due to complication error, 20% of the students who have actually passed were shown as failed and 20% of the students who have actually failed were declared as passed. what % of the students actually passed?

a) 68
b) 70
c) 72
d) 75
e) 75.5
[Reveal] Spoiler: OA

Originally posted by selim on 28 Jan 2018, 04:53.
Last edited by chetan2u on 28 Jan 2018, 06:25, edited 1 time in total.
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Re: In an exam 62% of the students were declared as passed. However, due t [#permalink]

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New post 28 Jan 2018, 06:24
selim wrote:
In an exam 62% of the students were declared as passed. However, due to complication error, 20% of the students who have actually passed were shown as failed and 20% of the students who have actually failed were declared as passed. what % of the students actually passed?

a) 68
b) 70
c) 72
d) 75
e) 75.5


Let there be p passed in 100 students, so 100-p failed..
So 62 consists of 80%pass and 20% fail..
0.8p+0.2(100-p)=62......0.8p+20-0.2p=62..
0.6p=42.....p=70

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Re: In an exam 62% of the students were declared as passed. However, due t   [#permalink] 28 Jan 2018, 06:24
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In an exam 62% of the students were declared as passed. However, due t

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