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At a certain school, the ratio of the number of English

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At a certain school, the ratio of the number of English [#permalink]

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New post 30 Mar 2013, 09:49
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At a certain school, the ratio of the number of English majors to the number of Sociology majors is 5 to 2, and the ratio of the number of Psychology majors to the number of Sociology majors is 3 to 4. If the ratio of the number of History majors to the number of English majors is 5 to 3, what is the ratio of the number of Psychology majors to the number of History majors?

(A) 25 to 3
(B) 10 to 9
(C) 9 to 50
(D) 6 to 25
(E) 3 to 10
[Reveal] Spoiler: OA

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Re: At a certain school, the ratio of the num [#permalink]

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New post 30 Mar 2013, 09:57
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\(\frac{E}{S} = \frac{5}{2}, \frac{P}{S}=\frac{3}{4}, \frac{H}{E}=\frac{5}{3}\)

\(\frac{P}{H}=?\)

\(\frac{P}{H}=\frac{P}{S}*\frac{S}{E}*\frac{E}{H}\)

\(\frac{P}{H}=\frac{3}{4}*\frac{2}{5}*\frac{3}{5}\)

\(\frac{P}{H}=\frac{9}{50}\)
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Re: R: At a certain school, the ratio of the number of English [#permalink]

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New post 31 Mar 2013, 06:36
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Re: At a certain school, the ratio of the number of English [#permalink]

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Zarrolou wrote:
\(\frac{E}{S} = \frac{5}{2}, \frac{P}{S}=\frac{3}{4}, \frac{H}{E}=\frac{5}{3}\)

\(\frac{P}{H}=?\)

\(\frac{P}{H}=\frac{P}{S}*\frac{S}{E}*\frac{E}{H}\)

\(\frac{P}{H}=\frac{3}{4}*\frac{2}{5}*\frac{3}{5}\)

\(\frac{P}{H}=\frac{9}{50}\)


Zarrolou

Can you explain by which rule/reasoning did you multiply the following?
P/H=P/S*S/E*E/H

Thanks in advance!
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Re: At a certain school, the ratio of the number of English [#permalink]

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New post 01 Apr 2015, 03:41
carcass wrote:
At a certain school, the ratio of the number of English majors to the number of Sociology majors is 5 to 2, and the ratio of the number of Psychology majors to the number of Sociology majors is 3 to 4. If the ratio of the number of History majors to the number of English majors is 5 to 3, what is the ratio of the number of Psychology majors to the number of History majors?

(A) 25 to 3
(B) 10 to 9
(C) 9 to 50
(D) 6 to 25
(E) 3 to 10



\(\frac{P}{S} * \frac{E}{H}* \frac{S}{E} = \frac{3}{4} * \frac{3}{5} *\frac{2}{5}\)

Answer C
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Re: At a certain school, the ratio of the number of English [#permalink]

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New post 02 Apr 2015, 22:31
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Hi All,

This series of 'overlapping' ratios can be dealt with by TESTing VALUES.

We're given the following ratios to work with:

E:S
5:2

P:S
3:4

H:E
5:3

We're asked for the ratio of P:H

Based on the given ratios, we know that E is a multiple of BOTH 3 and 5, so let's TEST E = 15....

IF....
E = 15
Then.....
S = 6
P = 4.5
H = 25

We now have a "grand ratio" that involves all 4 variables. Since we cannot have "half" a Psychology teacher, we can multiply each of these values by 2....this gives us....

E = 30
S = 12
P = 9
H = 50

The question asks for the ratio of the number of Psychology majors to the number of History majors...

P:H
9:50

Final Answer:
[Reveal] Spoiler:
C


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Re: At a certain school, the ratio of the number of English   [#permalink] 02 Apr 2015, 22:31
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