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If 37.5% of the 880 students at a certain college are enrolled in biol

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If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 12 Aug 2016, 08:02
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A
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C
D
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Question Stats:

89% (01:05) correct 11% (01:06) wrong based on 98 sessions

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If 37.5% of the 880 students at a certain college are enrolled in biology classes, how many students at the college are NOT enrolled in a biology class?

A. 110
B. 330
C. 550
D. 430
E. 880

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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 12 Aug 2016, 08:37
Students enrolled in biology are 37.5% and therefore not enrolled are 62.5%. so of 880 is 880*.625 = 550
Answer is C 550
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 12 Aug 2016, 09:16
(100- 37.5)% of 880 = 550
Option C
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 12 Aug 2016, 09:18
(100-37.5)%=62.5% of 880 are not enrolled in biology
=550
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 12 Aug 2016, 09:44
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Top Contributor
Bunuel wrote:
If 37.5% of the 880 students at a certain college are enrolled in biology classes, how many students at the college are NOT enrolled in a biology class?

A. 110
B. 330
C. 550
D. 430
E. 880


We can actually solve this question without doing any calculations. Instead, we'll just use a little number sense.

37.5% is less than 1/2.
So, if LESS THAN half of the 880 students ARE enrolled in biology, we can conclude that MORE THAN half of the 880 students are NOT enrolled in biology.
Half of 880 is 440, so we're looking for an answer choice that's GREATER THAN 440

This leaves C or E.
Of course, E makes no sense, so the correct answer is

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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 12 Aug 2016, 10:37
Bunuel wrote:
If 37.5% of the 880 students at a certain college are enrolled in biology classes, how many students at the college are NOT enrolled in a biology class?

A. 110
B. 330
C. 550
D. 430
E. 880


37.5% = 3/8

1 - 3/8 = 5/8*880 = 550

Answer: C
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 12 Aug 2016, 10:55
Ans :

There are 2 methods to this

Long method :

> 37.5 % of 880 = x (no of students studying biology)
> (37.5/100) * 880 = 330
>Since 330 people out of 880 people are studying biology
> No of people not studying biology = 880 - 330 = 550 people

Short Method

> We know 37.5 % people study biology,therefore the no of people not studying = 100 - 37.5 = 62.5%
> Therefore the people not studying biology out of a total 880 people are = 62.5 % of 880
> (62.5/100)*880 = 550 people
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 13 Aug 2016, 10:57
Top Contributor
Bunuel wrote:
If 37.5% of the 880 students at a certain college are enrolled in biology classes, how many students at the college are NOT enrolled in a biology class?

A. 110
B. 330
C. 550
D. 430
E. 880


Students at the college are NOT enrolled in a biology class must be greater than 50% or 440 and less than 880

Only Answer Choice C matched with above restriction

Correct Answer C
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 14 Aug 2016, 00:17
37.5 looks ugly.
The moment you convert it to 3/8, things get easy.
Conversions such as these save a lot of time on GMAT.
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol  [#permalink]

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New post 23 Jan 2019, 02:37
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Re: If 37.5% of the 880 students at a certain college are enrolled in biol   [#permalink] 23 Jan 2019, 02:37
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