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Rama’s Mathematics Test had 80 problems i.e.,40arithmetic, 30 algebra
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Bunuel
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Rama’s Mathematics Test had 80 problems i.e.,40arithmetic, 30 algebra [#permalink] New post  27 Jan 2021, 06:45
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A
B
C
D
E

Difficulty:

35% (medium)

Question Stats:

72% (01:26) correct 28% (01:50) wrong based on 18 sessions

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Rama’s Mathematics Test had 80 problems i.e.,40arithmetic, 30 algebra and 10 geometry problems. Although she answered 80% of the arithmetic, 60% of the algebra and 50% of the geometry problems correctly, she did not pass the test because she got less than 75%of the problems right. How many more questions she must have attempted correctly to earn a 75% passing grade ?

(A) 5
(B) 10
(C) 15
(D) 20
(E) 25
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lalithvoop
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Rama’s Mathematics Test had 80 problems i.e.,40arithmetic, 30 algebra [#permalink] New post  27 Jan 2021, 07:13
80% of the arithmetic questions answered = 32
60% of algebra questions answered = 18
50% of geometry questions answered = 5

total questions answered = 32+18+5 = 55

no of questions to be answered to pass the exam = 75% of 80 = 60

no of questions more questions to be answered correctly = 60 - 55 = 5 -> option A

**this is my first post, please forgive me if my answer is wrong and pls feel free to correct/provide an easy alternative**
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efflux
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Re: Rama’s Mathematics Test had 80 problems i.e.,40arithmetic, 30 algebra [#permalink] New post  27 Jan 2021, 07:56
My first reply on GC. The answer is 75%(80) - [80%(40)+60%(30)+50%(10)] = 60-55 =5.
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