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

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

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

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

Since 37.5% = 3/8, then 3/8 of the 880 students are enrolled in biology classes. This means 5/8 of the students, or 5/8 x 880 = 5 x 110 = 550 students, are not.

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Re: If 37.5% of the 880 students at a certain college are enrolled in biol [#permalink]
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% is 3/8. So students not enrolled is 5/8*880=5*110=550

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