Economist GMAT
On a construction site, 16 of the men wear helmets, and 19 of the women do not wear helmets. How many people are there on the construction site?
1) There are 21 men on the construction site.
2) There are 24 people that do not wear helmets on the construction site.
OA E
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
On a construction site, 16 of the men wear helmets, and 19
This topic has expert replies
GMAT/MBA Expert
-
Jay@ManhattanReview
- GMAT Instructor
- Posts: 3008
- Joined: Mon Aug 22, 2016 6:19 am
- Location: Grand Central / New York
- Thanked: 470 times
- Followed by:34 members
Timer
00:00
Your Answer
A
B
C
D
E
Global Stats
Pl. see this self-explanatory image.AAPL wrote:Economist GMAT
On a construction site, 16 of the men wear helmets, and 19 of the women do not wear helmets. How many people are there on the construction site?
1) There are 21 men on the construction site.
2) There are 24 people that do not wear helmets on the construction site.
OA E
The correct answer: E
Hope this helps!
-Jay
_________________
Manhattan Review
Locations: Manhattan Review Jayanagar | GMAT Prep Tarnaka | GRE Prep Madhapur | Kukatpally GRE Coaching | and many more...
Schedule your free consultation with an experienced GMAT Prep Advisor! [url=https://www.manhattanreview.com/gmat-prep-info/]Click here.[/u
GMAT/MBA Expert
-
Brent@GMATPrepNow
- GMAT Instructor
- Posts: 16207
- Joined: Mon Dec 08, 2008 6:26 pm
- Location: Vancouver, BC
- Thanked: 5254 times
- Followed by:1268 members
- GMAT Score:770
Timer
00:00
Your Answer
A
B
C
D
E
Global Stats
I thought I'd point out that Jay's approach is also known as the Double Matrix Method.
This technique can be used for most questions featuring a population in which each member has two characteristics associated with it.
Here, we have a population of construction worker, and the two characteristics are:
- male or female
- wears helmet or does not wear helmet
This question type is VERY COMMON on the GMAT, so be sure to master the technique.
To learn more about the Double Matrix Method, watch this video: https://www.gmatprepnow.com/module/gmat- ... ems?id=919
Once you're familiar with this technique, you can attempt these additional practice questions:
Easy Problem Solving questions
- https://www.beatthegmat.com/finance-majo ... 67425.html
Medium Problem Solving questions
- https://www.gmatprepnow.com/module/gmat- ... /video/920
- https://www.beatthegmat.com/posted-speed ... 72374.html
- https://www.beatthegmat.com/motel-t271938.html
- https://www.beatthegmat.com/of-the-appli ... 70255.html
- https://www.beatthegmat.com/opening-nigh ... 64869.html
- https://www.beatthegmat.com/at-least-100 ... 74669.html
- https://www.beatthegmat.com/prblem-solving-t279424.html
Difficult Problem Solving questions
- https://www.gmatprepnow.com/module/gmat- ... /video/946
- https://www.beatthegmat.com/ratio-problem-t268339.html
- https://www.beatthegmat.com/overlapping- ... 65223.html
- https://www.beatthegmat.com/fractions-t264254.html
- https://www.beatthegmat.com/overlapping- ... 64092.html
- https://www.beatthegmat.com/mba/2011/05/ ... question-2
Easy Data Sufficiency questions
- https://www.gmatprepnow.com/module/gmat- ... /video/943
- https://www.beatthegmat.com/for-what-per ... 70596.html
- https://www.beatthegmat.com/ds-quest-t187706.html
Medium Data Sufficiency questions
- https://www.beatthegmat.com/sets-matrix-ds-t271914.html
- https://www.beatthegmat.com/each-of-peop ... 71375.html
- https://www.beatthegmat.com/a-manufacturer-t270331.html
- https://www.beatthegmat.com/in-costume-f ... 69355.html
- https://www.beatthegmat.com/mba/2011/05/ ... question-1
Difficult Data Sufficiency questions
- https://youtu.be/dsCeqF9Kbk8
- https://www.beatthegmat.com/double-set-m ... 71423.html
- https://youtu.be/dOZ9KM1m5Hs
- https://www.beatthegmat.com/sets-t269449.html
- https://www.beatthegmat.com/mba/2011/05/ ... question-3
Cheers,
Brent
This technique can be used for most questions featuring a population in which each member has two characteristics associated with it.
Here, we have a population of construction worker, and the two characteristics are:
- male or female
- wears helmet or does not wear helmet
This question type is VERY COMMON on the GMAT, so be sure to master the technique.
To learn more about the Double Matrix Method, watch this video: https://www.gmatprepnow.com/module/gmat- ... ems?id=919
Once you're familiar with this technique, you can attempt these additional practice questions:
Easy Problem Solving questions
- https://www.beatthegmat.com/finance-majo ... 67425.html
Medium Problem Solving questions
- https://www.gmatprepnow.com/module/gmat- ... /video/920
- https://www.beatthegmat.com/posted-speed ... 72374.html
- https://www.beatthegmat.com/motel-t271938.html
- https://www.beatthegmat.com/of-the-appli ... 70255.html
- https://www.beatthegmat.com/opening-nigh ... 64869.html
- https://www.beatthegmat.com/at-least-100 ... 74669.html
- https://www.beatthegmat.com/prblem-solving-t279424.html
Difficult Problem Solving questions
- https://www.gmatprepnow.com/module/gmat- ... /video/946
- https://www.beatthegmat.com/ratio-problem-t268339.html
- https://www.beatthegmat.com/overlapping- ... 65223.html
- https://www.beatthegmat.com/fractions-t264254.html
- https://www.beatthegmat.com/overlapping- ... 64092.html
- https://www.beatthegmat.com/mba/2011/05/ ... question-2
Easy Data Sufficiency questions
- https://www.gmatprepnow.com/module/gmat- ... /video/943
- https://www.beatthegmat.com/for-what-per ... 70596.html
- https://www.beatthegmat.com/ds-quest-t187706.html
Medium Data Sufficiency questions
- https://www.beatthegmat.com/sets-matrix-ds-t271914.html
- https://www.beatthegmat.com/each-of-peop ... 71375.html
- https://www.beatthegmat.com/a-manufacturer-t270331.html
- https://www.beatthegmat.com/in-costume-f ... 69355.html
- https://www.beatthegmat.com/mba/2011/05/ ... question-1
Difficult Data Sufficiency questions
- https://youtu.be/dsCeqF9Kbk8
- https://www.beatthegmat.com/double-set-m ... 71423.html
- https://youtu.be/dOZ9KM1m5Hs
- https://www.beatthegmat.com/sets-t269449.html
- https://www.beatthegmat.com/mba/2011/05/ ... question-3
Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
-
deloitte247
- Legendary Member
- Posts: 2214
- Joined: Fri Mar 02, 2018 2:22 pm
- Followed by:5 members
Timer
00:00
Your Answer
A
B
C
D
E
Global Stats
Given;
16 men with helmet
19 women without helmet
To get the total number of people on site, we need to know either the total number of men and women or total number of people with helmet and people without helmet.
Statement 1--> There are 21 men on the construction site. This means that 5 men do not have helmet.
Also, there are 19 women without helmet but no information on the number of women with helmet or total no. of women.
Hence, Statement 1 is INSUFFICIENT
Statement 2 --> There are 24 people that do not wear helmets on the construction site. Out of the 24, 19 of them are women and 5 of them are men but there is no information on the total number of people with helmet. Hence, statement 2 is INSUFFICIENT.
Combining both statement together, we know the total number of men, but we do not know the total number of women.
Also, we know the total number of people without helmet but we do not know the total number of people with helmet.
Hence, the two statement together are INSUFFICIENT...
OPTION E is the correct answer.
16 men with helmet
19 women without helmet
To get the total number of people on site, we need to know either the total number of men and women or total number of people with helmet and people without helmet.
Statement 1--> There are 21 men on the construction site. This means that 5 men do not have helmet.
Also, there are 19 women without helmet but no information on the number of women with helmet or total no. of women.
Hence, Statement 1 is INSUFFICIENT
Statement 2 --> There are 24 people that do not wear helmets on the construction site. Out of the 24, 19 of them are women and 5 of them are men but there is no information on the total number of people with helmet. Hence, statement 2 is INSUFFICIENT.
Combining both statement together, we know the total number of men, but we do not know the total number of women.
Also, we know the total number of people without helmet but we do not know the total number of people with helmet.
Hence, the two statement together are INSUFFICIENT...
OPTION E is the correct answer.
