Last visit was: 27 Apr 2026, 11:01 It is currently 27 Apr 2026, 11:01
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
FN
User avatar
Current Student
Joined: 28 Dec 2004
Last visit: 07 May 2012
Posts: 1,575
Own Kudos:
687
Given Kudos: 2
Location: New York City
Concentration: Social Enterprise
Schools:Wharton'11 HBS'12
Posts: 1,575
Kudos: 687
G-Prep 31 May 2008, 12:43
Kudos
Add Kudos
Bookmarks
Bookmark this Post
see if you can explain this one..



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
bkk145
User avatar
Joined: 10 Jun 2007
Last visit: 23 Feb 2014
Posts: 645
Own Kudos:
1,801
Posts: 645
Kudos: 1,801
G-Prep 31 May 2008, 12:53
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I got 40, same as yours. Don't know what else to explain...
User avatar
gmatnub
User avatar
Joined: 23 Sep 2007
Last visit: 23 Dec 2008
Posts: 393
Own Kudos:
1,682
Posts: 393
Kudos: 1,682
G-Prep 31 May 2008, 12:55
Kudos
Add Kudos
Bookmarks
Bookmark this Post
350/7 = 50, 50 is not an answer choice

7 * 40 = 280
350-280 = 70

but 70 is 7 short of 77
so we must have 39 7s and 1 77
39 + 1 = 40

BTW, I got this question wrong, I picked 39 because I forgot to add 1 to 39
User avatar
zeenie
User avatar
Joined: 28 May 2008
Last visit: 12 Aug 2008
Posts: 50
Own Kudos:
13
Posts: 50
Kudos: 13
G-Prep 31 May 2008, 12:56
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hellooo
Lets see
Let the number of 7s be x and the number of 77s be y
So, we have
7x+77y=350
which means
x+11y=50
now if y=1 ,x=39
so total number =39+1=40 !:)

if we try y=2, x = 28
and x will go on decreasing as y increases.So no point substituting other values.
Whats the answer by the way ?
please shoot any questions yu got

cheers !!
User avatar
bkk145
User avatar
Joined: 10 Jun 2007
Last visit: 23 Feb 2014
Posts: 645
Own Kudos:
1,801
Posts: 645
Kudos: 1,801
G-Prep 31 May 2008, 13:01
Kudos
Add Kudos
Bookmarks
Bookmark this Post
An easy way to look at this is if you have the sum of 350, and every unit digit of the terms are 7, then 10 must be the factor of the total numbers since nothing times 7 will makes a unit digit of 0 except 10. This means the terms must be in multiple of 10.
User avatar
zeenie
User avatar
Joined: 28 May 2008
Last visit: 12 Aug 2008
Posts: 50
Own Kudos:
13
Posts: 50
Kudos: 13
G-Prep 31 May 2008, 13:07
Kudos
Add Kudos
Bookmarks
Bookmark this Post
bkk145
An easy way to look at this is if you have the sum of 350, and every unit digit of the terms are 7, then 10 must be the factor of the total numbers since nothing times 7 will makes a unit digit of 0 except 10. This means the terms must be in multiple of 10.
Show more

Thats intelligent !
User avatar
FN
User avatar
Current Student
Joined: 28 Dec 2004
Last visit: 07 May 2012
Posts: 1,575
Own Kudos:
687
Given Kudos: 2
Location: New York City
Concentration: Social Enterprise
Schools:Wharton'11 HBS'12
Posts: 1,575
Kudos: 687
G-Prep 31 May 2008, 13:29
Kudos
Add Kudos
Bookmarks
Bookmark this Post
yeah..i made an intelligent guess..but i was hoping for a methodological way of doing this..

i guess in hindsight i could have dont like this..

39*7=273+77=350...

i knew that the number of terms had to be something with 9 and 1..to get unit digit 3 and 7...



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!