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In Mr. Smith's class, what is the ratio of the number of boys to the number of girls?

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In Mr. Smith's class, what is the ratio of the number of boys to the number of girls?

by Vincen » Wed Aug 26, 2020 2:50 am

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In Mr. Smith's class, what is the ratio of the number of boys to the number of girls?

(1) There are 3 times as many girls as boys in Mr. Smith's class.
(2) The number of boys is 1/4 of the total number of boys and girls in Mr. Smith's class.

Answer: D

Source: Official Guide
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Source: — Data Sufficiency |

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Re: In Mr. Smith's class, what is the ratio of the number of boys to the number of girls?

by Brent@GMATPrepNow » Wed Aug 26, 2020 5:33 am

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Vincen wrote: ↑
Wed Aug 26, 2020 2:50 am
 In Mr. Smith's class, what is the ratio of the number of boys to the number of girls?

(1) There are 3 times as many girls as boys in Mr. Smith's class.
(2) The number of boys is 1/4 of the total number of boys and girls in Mr. Smith's class.

Answer: D

Source: Official Guide
Target question: What is the ratio of the number of boys to the number of girls?

Statement 1: There are 3 times as many girls as boys in Mr. Smith's class.
This means there are 3 girls for every 1 boy
So, the ratio of the number of boys to the number of girls = 3 : 1
Since we can answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: The number of boys is 1/4 of the total number of boys and girls in Mr. Smith's class.
So, for every 4 children there are 3 girls and 1 boy
So, the ratio of the number of boys to the number of girls = 3 : 1
Since we can answer the target question with certainty, statement 2 is SUFFICIENT

Answer: D
Brent Hanneson - Creator of GMATPrepNow.com
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