• Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep

500 PS

This topic has 1 expert reply and 3 member replies
dunkin77 Master | Next Rank: 500 Posts Default Avatar
Joined
01 Apr 2007
Posted:
269 messages

500 PS

Post Wed Apr 04, 2007 11:24 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,

    My answer was B) by... 0.5*0.9=0.54+0.05=0.59 but the corect answer was A) - can anyone help please?


    Of a group of people surveyed in a political poll, 60 percent said that they would vote for candidate R. Of those who said they would vote for R. 90 percent actually voted for R. and of those who did not say that they would vote for R. 5 percent actually voted for R. What percent of the group voted for R?
    (A) 56% (B) 59% (C) 62%
    (D) 65% (E) 74%

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    gabriel Legendary Member
    Joined
    20 Dec 2006
    Posted:
    986 messages
    Followed by:
    1 members
    Thanked:
    51 times
    Post Wed Apr 04, 2007 12:50 pm
    dunkin77 wrote:
    Hi,

    My answer was B) by... 0.5*0.9=0.54+0.05=0.59 but the corect answer was A) - can anyone help please?


    Of a group of people surveyed in a political poll, 60 percent said that they would vote for candidate R. Of those who said they would vote for R. 90 percent actually voted for R. and of those who did not say that they would vote for R. 5 percent actually voted for R. What percent of the group voted for R?
    (A) 56% (B) 59% (C) 62%
    (D) 65% (E) 74%
    5 % of people who did vote for R inspite of saying no wuld equal to =0.4*0.05 = 0.02

    so ur answer is 0.6*0.9+0.02=0.56 ...A

    dunkin77 Master | Next Rank: 500 Posts Default Avatar
    Joined
    01 Apr 2007
    Posted:
    269 messages
    Post Wed Apr 04, 2007 1:20 pm
    ohh - I see - thank yoU!

    Post Sat Nov 04, 2017 11:23 pm
    Let the total number of people that took the survey be n. Also let x and y represent the total number of people who said they would vote for candidate R and those who didn't say they will vote for R respectively.
    from the question,
    x=60% of n
    i.e x=0.6n and
    y=(100-60)% of n = 40% of n
    i.e y=0.4n
    Now, the number of people who actually voted for R is = 90% of x + 5% of y
    =0.9x + 0.05y
    =0.9(0.6n) + 0.05(0.4n)
    =0.54n + 0.02n
    =0.56n
    = $$\frac{56}{100}n$$
    $$i.e\ 56\%\ of\ n$$
    the correct answer is A

    GMAT/MBA Expert

    Post Thu Nov 09, 2017 7:29 pm
    (90% of 60) + (5% of 40) =>

    .9 * 60 + .05 * 40 =>

    54 + 2 =>

    56

    Enroll in a Veritas Prep GMAT class completely for FREE. Wondering if a GMAT course is right for you? Attend the first class session of an actual GMAT course, either in-person or live online, and see for yourself why so many students choose to work with Veritas Prep. Find a class now!

    Best Conversation Starters

    1 LUANDATO 148 topics
    2 lheiannie07 91 topics
    3 Roland2rule 79 topics
    4 AAPL 66 topics
    5 ardz24 64 topics
    See More Top Beat The GMAT Members...

    Most Active Experts

    1 image description EconomistGMATTutor

    The Economist GMAT Tutor

    157 posts
    2 image description Jay@ManhattanReview

    Manhattan Review

    128 posts
    3 image description GMATGuruNY

    The Princeton Review Teacher

    127 posts
    4 image description Rich.C@EMPOWERgma...

    EMPOWERgmat

    120 posts
    5 image description Brent@GMATPrepNow

    GMAT Prep Now Teacher

    109 posts
    See More Top Beat The GMAT Experts