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Lily scored 50% of the maximum marks in an exam and yet failed by 12

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Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 16 Jan 2020, 02:16
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A
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E

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Question Stats:

72% (01:37) correct 28% (01:32) wrong based on 71 sessions

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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 16 Jan 2020, 05:44
.5x+12=.5x*1.1
x= 240
IMO E


Bunuel wrote:
Lily scored 50% of the maximum marks in an exam and yet failed by 12 marks. Had she scored 10% more than what he scored, she would have just got passing marks. What is the maximum marks of the exam?

A. 100
B. 120
C. 180
D. 200
E. 240
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 17 Jan 2020, 11:16
Let maximum marks be x

Lily got 0.5x (50% of max marks)

Given: she failed by 12 marks and had she got 10% more than what she got, she wouldve passed.

Equation:

0.5x*0.1 = 12
0.5x = 12/0.1
x = 120/0.5

x= 240

Hence maximum marks = 240

Answer : E
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 19 Jan 2020, 14:12
For me, it seems that the right asnwer is B.

Given: Lily failed while got 50% of the mark. She needs 10% more or 12 points.
So, 12 points = 10%, and 120 points = 100%

Try to check: Lily scored 60 points (50% 0f 120) and she needs to get 72 points (60% of 120) for passing an exam.

Could you please show me my mistake?

Thank you in advance!
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 19 Jan 2020, 20:44
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Bunuel wrote:
Lily scored 50% of the maximum marks in an exam and yet failed by 12 marks. Had she scored 10% more than what he scored, she would have just got passing marks. What is the maximum marks of the exam?

A. 100
B. 120
C. 180
D. 200
E. 240

Let maximum marks be x
Lily scored 50% of the maximum marks in an exam and yet failed by 12 marks
Passing marks = (x/2) + 12----(i)

Had she scored 10% more than what he scored, she would have just got passing marks
Passing marks = 1.1(x/2)----(ii)

(x/2) + 12 = 1.1(x/2)
x = 240

E is correct.
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 19 Jan 2020, 22:48
Let the maximum marks be x

50% of x + 12 = 10% more than what he scored. ( He scored 50% of x = ½*x)
½*x +12 = 110/100 * ½*x
½*x +12 = 11/10* ½*x
11*x/20 – ½*x = 12
x/20 = 12
x = 240(E)
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 25 Jan 2020, 02:57
BvR wrote:
For me, it seems that the right asnwer is B.

Given: Lily failed while got 50% of the mark. She needs 10% more or 12 points.
So, 12 points = 10%, and 120 points = 100%

Try to check: Lily scored 60 points (50% 0f 120) and she needs to get 72 points (60% of 120) for passing an exam.


Could you please show me my mistake?

Thank you in advance!


Posted from my mobile device



10% of 50%.... Not 10%0 of total marks... Hope it helps ?
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 25 Jan 2020, 03:30
Hey Bunuel,Answer should be Option E

Posted from my mobile device
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 26 Jan 2020, 10:36
BvR wrote:
For me, it seems that the right asnwer is B.

Given: Lily failed while got 50% of the mark. She needs 10% more or 12 points.
So, 12 points = 10%, and 120 points = 100%

Try to check: Lily scored 60 points (50% 0f 120) and she needs to get 72 points (60% of 120) for passing an exam.

Could you please show me my mistake?

Thank you in advance!



it is not correct because the question states that she had to take an additional 10% of her grade to pass the exam and not an additional 10% of the maximum grade. Thus it does not mean that she has to take 60% of the maximum grade (as you stated).

According to other answers 12= 0.5x*0.1 where x= maximum grade
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12  [#permalink]

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New post 09 Feb 2020, 03:21
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Re: Lily scored 50% of the maximum marks in an exam and yet failed by 12   [#permalink] 09 Feb 2020, 03:21
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Lily scored 50% of the maximum marks in an exam and yet failed by 12

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