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Joined: 20 Feb 2017
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A certain class is divided into two sections A and B of equal number
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26 Nov 2021, 05:13
26 Nov 2021, 05:13
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A certain class is divided into two sections A and B of equal number of students. If the ratio of girls to boys for whole class is 3/5 and the ratio of girls to boys in section A is 5/7. What is the ratio of girls to boys in section B?
A. 3 to 1
B. 2 to 1
C. 1 to 3
D. 1 to 2
E. 7 to 12
A. 3 to 1
B. 2 to 1
C. 1 to 3
D. 1 to 2
E. 7 to 12
Re: A certain class is divided into two sections A and B of equal number
[#permalink]
26 Nov 2021, 06:00
26 Nov 2021, 06:00
Expert Reply
The class is divided into sections with equal no of students so weights are same.
Avg concentration of girls = 3/8
Concentration of girls in A = 5/12
Concentration of girls in B = x
(5/12 + x)/2 = 3/8
x = 1/3
Girls:Boys in B = 1:2
Answer (D)
Avg concentration of girls = 3/8
Concentration of girls in A = 5/12
Concentration of girls in B = x
(5/12 + x)/2 = 3/8
x = 1/3
Girls:Boys in B = 1:2
Answer (D)
gmatclubot
Re: A certain class is divided into two sections A and B of equal number [#permalink]
26 Nov 2021, 06:00
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