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A certain science class has a total of 35 students. If the ratio of

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A certain science class has a total of 35 students. If the ratio of  [#permalink]

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19 Mar 2018, 23:27
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A certain science class has a total of 35 students. If the ratio of girls to boys in the class is 4:3, how many more girls than boys are in the class?

A. 1
B. 5
C. 7
D. 15
E. 20

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Re: A certain science class has a total of 35 students. If the ratio of  [#permalink]

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19 Mar 2018, 23:40
Bunuel wrote:
A certain science class has a total of 35 students. If the ratio of girls to boys in the class is 4:3, how many more girls than boys are in the class?

A. 1
B. 5
C. 7
D. 15
E. 20

ratio 4x:3x
total= 7x parts = 35(given)

x= 35/7 =5

girls = 4x = 20
boys = 3x = 15

B 5
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Re: A certain science class has a total of 35 students. If the ratio of  [#permalink]

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19 Mar 2018, 23:42
Bunuel wrote:
A certain science class has a total of 35 students. If the ratio of girls to boys in the class is 4:3, how many more girls than boys are in the class?

A. 1
B. 5
C. 7
D. 15
E. 20

Since there are 35 students in the class, and the ratio G:B - 4:3
there will be $$\frac{4}{7} * 35 = 20$$ girls and $$\frac{3}{7} * 35 = 15$$ boys in the class.

Therefore, there are 20-15 = 5(Option B) more girls than boys in the class
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Re: A certain science class has a total of 35 students. If the ratio of  [#permalink]

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20 Mar 2018, 10:53
Bunuel wrote:
A certain science class has a total of 35 students. If the ratio of girls to boys in the class is 4:3, how many more girls than boys are in the class?

A. 1
B. 5
C. 7
D. 15
E. 20

$$\frac{35}{(4 + 3)}*(4 - 3) = 5$$, Answer must be (B)
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Re: A certain science class has a total of 35 students. If the ratio of  [#permalink]

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20 Mar 2018, 14:10
Total no. of girls=$$\frac{4}{7}$$*35=20 so, boys 15. Difference 20-15=5. (D)
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Re: A certain science class has a total of 35 students. If the ratio of  [#permalink]

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20 Mar 2018, 15:44
Bunuel wrote:
A certain science class has a total of 35 students. If the ratio of girls to boys in the class is 4:3, how many more girls than boys are in the class?

A. 1
B. 5
C. 7
D. 15
E. 20

Difference between girls and boys is 1/7 of total class

1/7 * 35 = 5

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Joined: 28 Apr 2014
Posts: 49
GMAT 1: 640 Q50 V25
Re: A certain science class has a total of 35 students. If the ratio of  [#permalink]

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21 Mar 2018, 08:19
7x=35
x=5

diff is x. hence 5
Re: A certain science class has a total of 35 students. If the ratio of   [#permalink] 21 Mar 2018, 08:19
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