GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 22 Nov 2019, 05:25

Close

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

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

In Dewey Elementary School, there are two second-grade classes: class

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 59264
In Dewey Elementary School, there are two second-grade classes: class  [#permalink]

Show Tags

New post 18 Oct 2018, 02:45
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (01:42) correct 15% (02:02) wrong based on 80 sessions

HideShow timer Statistics

In Dewey Elementary School, there are two second-grade classes: class A has 35 students and class B has 45 students. If 40% of the students in class A walk to school, and 80% of the students in class B walk to school, what percent of all the students in the second-grade at Dewey Elementary walk to school?

A. 40%
B. 42.5%
C. 60%
D. 62.5%
E. 75%

_________________
CEO
CEO
User avatar
D
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2977
Location: India
GMAT: INSIGHT
Schools: Darden '21
WE: Education (Education)
Reviews Badge
Re: In Dewey Elementary School, there are two second-grade classes: class  [#permalink]

Show Tags

New post 18 Oct 2018, 04:14
Bunuel wrote:
In Dewey Elementary School, there are two second-grade classes: class A has 35 students and class B has 45 students. If 40% of the students in class A walk to school, and 80% of the students in class B walk to school, what percent of all the students in the second-grade at Dewey Elementary walk to school?

A. 40%
B. 42.5%
C. 60%
D. 62.5%
E. 75%


Students who walk to school = (40/100)*35 + (80/100)*45 = 14+36 = 50

Total Students = 35+45 = 80

Percentage of total students = (50/80)*100 = 62.5%

Answer: Option D
_________________
Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION
Target Test Prep Representative
User avatar
V
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8456
Location: United States (CA)
Re: In Dewey Elementary School, there are two second-grade classes: class  [#permalink]

Show Tags

New post 19 Oct 2018, 15:24
Bunuel wrote:
In Dewey Elementary School, there are two second-grade classes: class A has 35 students and class B has 45 students. If 40% of the students in class A walk to school, and 80% of the students in class B walk to school, what percent of all the students in the second-grade at Dewey Elementary walk to school?

A. 40%
B. 42.5%
C. 60%
D. 62.5%
E. 75%


(35 x 0.4 + 45 x 0.8)/(35 + 45) x 100 = 50/80 x 100 = 62.5 percent

Answer: D
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Senior Manager
Senior Manager
avatar
G
Joined: 04 Aug 2010
Posts: 493
Schools: Dartmouth College
Re: In Dewey Elementary School, there are two second-grade classes: class  [#permalink]

Show Tags

New post 07 Nov 2019, 05:35
Bunuel wrote:
In Dewey Elementary School, there are two second-grade classes: class A has 35 students and class B has 45 students. If 40% of the students in class A walk to school, and 80% of the students in class B walk to school, what percent of all the students in the second-grade at Dewey Elementary walk to school?

A. 40%
B. 42.5%
C. 60%
D. 62.5%
E. 75%


Alternate approach:

Student ratio for A to B = 35:45 = 7:9.
Of every 16 students, 7 are in A and 9 are in B.
Since the walk rate for A is 40%, while the walk rate for B is 80%, the average walk rate per 16 students is as follows:
\(\frac{(7*40 + 9*80)}{16} = \frac{1000}{16} = \frac{500}{8} =\) a bit more than 60.

.
_________________
GMAT and GRE Tutor
Over 1800 followers
GMATGuruNY@gmail.com
New York, NY
If you find one of my posts helpful, please take a moment to click on the "Kudos" icon.
Available for tutoring in NYC and long-distance.
For more information, please email me at GMATGuruNY@gmail.com.
GMAT Club Bot
Re: In Dewey Elementary School, there are two second-grade classes: class   [#permalink] 07 Nov 2019, 05:35
Display posts from previous: Sort by

In Dewey Elementary School, there are two second-grade classes: class

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne