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Fractions, ratio and decimals

This topic has 2 expert replies and 0 member replies

Fractions, ratio and decimals

Post Mon Sep 18, 2017 1:36 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    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.

    a. None of the statement is sufficient
    b. only statement 1 is sufficient
    c. statement 1 and 2 are sufficient
    d. statement 2 is not sufficient
    e. statement 2 is sufficient and statement 1 is insufficient

    QA is c.

    why is statement 2 wrong?

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    Post Mon Sep 18, 2017 1:41 pm
    Roland2rule wrote:
    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.
    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

    Cheers,
    Brent

    _________________
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    Post Mon Sep 18, 2017 1:42 pm
    Roland2rule wrote:
    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.

    a. None of the statement is sufficient
    b. only statement 1 is sufficient
    c. statement 1 and 2 are sufficient
    d. statement 2 is not sufficient
    e. statement 2 is sufficient and statement 1 is insufficient

    QA is c.

    why is statement 2 wrong?
    Hey Roland2rule,

    You have posted incorrect answers to several questions.
    Please look at the answer key before posting more incorrect answers.


    Cheers,
    Brent

    _________________
    Brent Hanneson – Founder of GMATPrepNow.com
    Use our video course along with Beat The GMAT's free 60-Day Study Guide

    Check out the online reviews of our course
    Come see all of our free resources

    GMAT Prep Now's comprehensive video course can be used in conjunction with Beat The GMAT’s FREE 60-Day Study Guide and reach your target score in 2 months!

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