A researcher has determined that she requires a minimum of n responses to a survey for the results to be valid. If p% of the surveyed individuals fail to respond to the survey, how many individuals, in terms of n and p, must the researcher survey to produce twice the minimum required number of responses? A) 200n/100-p B) 2n/100-p C) 200n/p D) 2n(100+p)/100 E) 2n+2np/100 OAA

Hi rsarashi, This question was discussed here: https://www.beatthegmat.com/a-researcher ... 85176.html GMAT assassins aren't born, they're made, Rich

If we send out x surveys, we know that (1 - p/100), or (100 - p)/100 people will respond. We want that number to be at least 2n, so x * (100 - p)/100 = 2n x = 2n * 100 / (100 - p) and our answer is A.

We could also always pick our own numbers: this is a great, mostly foolproof way to get the answer on the test when you either can't set up the algebra or fear that you've written the wrong equation. Suppose n = 50 and p = 20. Then we're going to need 125 surveys. Plugging n = 50 and p = 20 into the answers, we want the answer that gives 125. A works, so we're set!

rsarashi wrote: ↑Sat May 20, 2017 10:46 pm A researcher has determined that she requires a minimum of n responses to a survey for the results to be valid. If p% of the surveyed individuals fail to respond to the survey, how many individuals, in terms of n and p, must the researcher survey to produce twice the minimum required number of responses? A) 200n/100-p B) 2n/100-p C) 200n/p D) 2n(100+p)/100 E) 2n+2np/100 OAA Let x = total number of people she surveys. Therefore, we have: x(1 - p/100) = 2n x(100 - p)/100 = 2n x = 2n * 100/(100 - p) x = 200n/(100 - p) Answer: A

A researcher has determined that she requires a minimum of n - The Beat The GMAT Forum

GMATLiveTeachStarts Nov 22

LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow: Sun · 9:30 AM to 12:30 PM ET
Included: 40 hours of live online classes + 6 months of TTP OnDemand

Attend the first class for free
Every class is recorded, so you never fall behind

View classes & enroll

Limited seats available

EALiveTeachOnDemandStart anytime

EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee

$05-day trial no automatic billing

Schedule
Included: 40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.

165+ EA Score Guarantee
4,100+ Quant, Verbal, and Integrated Reasoning practice questions
400+ hours of in-depth video lessons
3,000+ step-by-step video solutions

View EA class & enroll Start free 5-day trial

Limited cohort · enrollment openTrial includes full course access

GMATOnDemandStart anytime

SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee

$0to start then $127/mo

Personalized study plan and analytics
Thousands of lessons and practice questions

Start free 5-day trial

Read 563 reviews

Choose how you want to prepare

Get Ready for GMAT Test Day Faster with Live Online Classes

Target Test Prep EA OnDemand

Target Test Prep GMAT OnDemand

A researcher has determined that she requires a minimum of n

GMAT/MBA Expert

GMAT/MBA Expert

Re: A researcher has determined that she requires a minimum of n

Chicago Booth

GMAT Course Reviews

Admissions Consulting Reviews

FREE GMAT PREP RESOURCES

GMAT PREP DEAL TRACKER