Find all School-related info fast with the new School-Specific MBA Forum

It is currently 03 Jun 2015, 11:11

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Mike has to take 5 tests containing 80 questions each. After

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
CEO
CEO
User avatar
Joined: 21 Jan 2007
Posts: 2762
Location: New York City
Followers: 9

Kudos [?]: 361 [0], given: 4

Mike has to take 5 tests containing 80 questions each. After [#permalink] New post 03 Nov 2007, 15:24
Mike has to take 5 tests containing 80 questions each. After completing four tests, Mike has an average of 80 percent of correct answers. What is the least number of questions Mike needs to get right in the ffth test to bring his average to 82%?

70
72
75
78
80
Current Student
avatar
Joined: 03 Oct 2006
Posts: 85
Followers: 1

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 03 Nov 2007, 15:31
B 72

I'm sure there's a simple equation, but I did this piece meal.

80% of 80 = 64
64 * 4 = 256 correct answers on 4 tests

82% of (80 * 5) = 328

328-256 = 72
Senior Manager
Senior Manager
avatar
Joined: 04 Jun 2007
Posts: 374
Followers: 1

Kudos [?]: 22 [0], given: 0

Re: Easy Avg question [#permalink] New post 03 Nov 2007, 15:33
bmwhype2 wrote:
Mike has to take 5 tests containing 80 questions each. After completing four tests, Mike has an average of 80 percent of correct answers. What is the least number of questions Mike needs to get right in the ffth test to bring his average to 82%?

70
72
75
78
80


320*80%= 256 right
400*82%= 328 right
he needs to get another 328-256= 72 questions right
Director
Director
avatar
Joined: 11 Jun 2007
Posts: 932
Followers: 1

Kudos [?]: 76 [0], given: 0

Re: Easy Avg question [#permalink] New post 03 Nov 2007, 15:37
bmwhype2 wrote:
Mike has to take 5 tests containing 80 questions each. After completing four tests, Mike has an average of 80 percent of correct answers. What is the least number of questions Mike needs to get right in the ffth test to bring his average to 82%?

70
72
75
78
80


another approach:

80% * 4 = 320
82% * 5 = 410
so we know he as to get 90% on his 5th test

.9*80 = 72
CEO
CEO
User avatar
Joined: 29 Mar 2007
Posts: 2588
Followers: 17

Kudos [?]: 238 [0], given: 0

Re: Easy Avg question [#permalink] New post 03 Nov 2007, 19:20
bmwhype2 wrote:
Mike has to take 5 tests containing 80 questions each. After completing four tests, Mike has an average of 80 percent of correct answers. What is the least number of questions Mike needs to get right in the ffth test to bring his average to 82%?

70
72
75
78
80



.8(320)/320=.8


256+X/400=.82

328=X+256
x=72

B
Re: Easy Avg question   [#permalink] 03 Nov 2007, 19:20
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic After taking N tests, each containing 100 questions gmatquant25 4 11 Jun 2013, 12:04
2 Experts publish their posts in the topic On a class test there are 5 questions. One question has been jlo0909 8 27 Mar 2013, 11:41
Experts publish their posts in the topic In a multiple choice test comprising 5 Questions, each with SOURH7WK 3 07 Aug 2012, 05:58
Mike has to take five tests containing 80 questions each. bmwhype2 6 22 Nov 2007, 17:46
Taking test after prep course sonibubu 2 10 Nov 2007, 20:38
Display posts from previous: Sort by

Mike has to take 5 tests containing 80 questions each. After

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.