Page 1 of 1 [ 2 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Data Sufficiency #57 (page 81)Posted: Sun Apr 10, 2011 1:07 pm

Joined: Thu Jun 03, 2010 6:58 pm
Posts: 8
I am hoping someone can confirm my understanding of the principle behind the answer to this question because I think the explanation in the back of the book is unclear.

Is the average of a and b less than 40?

1. The average of 3a and 3b is 117

3a + 3b/2 = 117

So, I just want to make sure that the principle here is that a+b/2 = 117/3 (or a+b/2 =39) thus less than 40 and it's sufficient?

Thanks

Top

 Post subject: Re: Data Sufficiency #57 (page 81)Posted: Sun Apr 10, 2011 8:17 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
It looks like you have it. I'm going to clarify notation, but I think you're on the right track.

If the average of 3a and 3b is 117, then
(3a+3b)/2 = 117
This means that either
3a + 3b = 234
a+b = 78
OR we might write
(3a+3b)/2 = 117
(a+b)/2 = 117/3
(a+b)/2 = 39
(a+b) = 78

Both, obviously, get us the same place.
And yes, it's sufficient to answer the question.

Veritas Help

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 2 posts ]

 All times are UTC - 8 hours [ DST ]

#### Who is online

Users browsing this forum: No registered users and 1 guest

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

 Search for: