Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Jul 0901:00 PM EDT
-02:00 PM EDT
More Target Test Prep students are earning 100th percentile GMAT scores. Don’t settle for less when the Target Test Prep course gives you everything you need to score high on the GMAT. Start your 5-day free trial today.
Jul 1410:00 AM PDT
-11:59 PM PDT
GMAT Preparation Online - A limited time sale use code: EXPERTSGLOBAL10- Jul 15
08:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations! 
Jul 1609:30 AM EDT
-11:30 AM EDT
Is INSEAD your dream b-school and you're looking for solid prep and application strategies to get there? Check out Barkavi’s end-to-end journey to know how she did! Get insights into the INSEAD admissions process, know what Adcoms look at, and more!
Jul 1611:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors.
Jul 1911:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment
TulikaArya
Joined: 13 Feb 2022
Last visit: 31 May 2024
Posts: 20
Given Kudos: 296
Location: India
Schools: DeGroote (A$)
GPA: 3.54
WE:Management Consulting (Consulting)
Updated on: 23 Dec 2022, 00:33
Originally posted by TulikaArya on 22 Dec 2022, 14:34.
Last edited by Bunuel on 23 Dec 2022, 00:33, edited 1 time in total.
Last edited by Bunuel on 23 Dec 2022, 00:33, edited 1 time in total.
Renamed the topic.
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
54% (03:38) correct
46%
(03:52)
wrong
based on 71
sessions
History
Date
Time
Result
Not Attempted Yet
In city X, the ratio of the number of people who were tested Covid positive to the number of the people who were tested Covid not positive is 70:30. However, 80 percent of the people who did not show Covid symptoms, were tested Covid positive and 60 percent of the people who showed Covid symptoms, did not test Covid positive. Of the people who did not test Covid positive, what was the approximate percent of the people who showed Covid symptoms?
(a) 15%
(b) 45%
(c) 50%
(d) 65%
(e) 70%
(a) 15%
(b) 45%
(c) 50%
(d) 65%
(e) 70%
22 Dec 2022, 23:30
Kudos
Bookmarks
tulikas024
In city X, the ratio of the number of people who were tested Covid positive to the number of the people who were tested Covid not positive is 70:30. However, 80 percent of the people who did not show Covid symptoms, were tested Covid positive and 60 percent of the people who showed Covid symptoms, did not test Covid positive. Of the people who did not test Covid positive, what was the approximate percent of the people who showed Covid symptoms?
(a) 15%
(b) 45%
(c) 50%
(d) 65%
(e) 70%
(a) 15%
(b) 45%
(c) 50%
(d) 65%
(e) 70%
We can use a 2*2 matrix to solve the question.
Let's assume that the number of people in city X = 100
- Number of people who were tested positive = \(\frac{70}{100} * 100 = 70\)
- Number of people who were not tested positive = \(\frac{30}{100} * 100 = 30\)
- Number of people who did not show symptom = x
80 percent of the people who did not show Covid symptoms, were tested Covid positive = 80% of x = 0.8x - Number of people who showed symptom = 100-x
60 percent of the people who showed Covid symptoms, did not test Covid positive = 60% of x
We can equate the number of people who showed symptoms and were actually tested positive ⇒
\(\frac{40}{100}(100-x) = 70-0.8x \)
\(x= \frac{150}{2}\)
Number of people who showed covid symptoms but were not tested positive = 60% of (100 - x)
= \(\frac{60}{100} * (100 - \frac{150}{2}) = 15\)
Required percentage = \(\frac{15}{30} * 100 = 50%\)
Option C
Attachments
Screenshot 2022-12-23 115937.jpg [ 105.03 KiB | Viewed 2055 times ]
07 Jun 2025, 14:14
Kudos
Bookmarks
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
