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At a certain school, the ratio of students to teachers is 9:2, and the
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09 Mar 2021, 05:10
09 Mar 2021, 05:10
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At a certain school, the ratio of students to teachers is 9:2, and the ratio of teachers to administrators is 5:3. Which of the following could be the total number of students at the school?
(Indicate all that apply.)
80
90
120
180
200
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
(Indicate all that apply.)
80
90
120
180
200
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
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At a certain school, the ratio of students to teachers is 9:2, and the
[#permalink]
09 Mar 2021, 09:04
09 Mar 2021, 09:04
Carcass wrote:
At a certain school, the ratio of students to teachers is 9:2, and the ratio of teachers to administrators is 5:3. Which of the following could be the total number of students at the school?
(Indicate all that apply.)
80
90
120
180
200
(Indicate all that apply.)
80
90
120
180
200
\(\frac{S}{T} = \frac{9}{2}\) \(\frac{T}{A} = \frac{5}{3}\)
Making T equal by taking LCM;
\(\frac{S}{T} = \frac{45}{10}\) \(\frac{T}{A} = \frac{10}{6}\)
\(S : T : A\) = \(45 : 10 : 6\)
This means, S must be a multiple of 45
Hence, option B and D
At a certain school, the ratio of students to teachers is 9:2, and the
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29 Apr 2021, 16:35
29 Apr 2021, 16:35
Since you can't have a fraction of a person, any multiple of 9*5 will be an answer.
You don't need to consider the three since 3 is a factor of 9, and all the answers are even, so 2 is assumed to be correct.
You don't need to consider the three since 3 is a factor of 9, and all the answers are even, so 2 is assumed to be correct.
