It is currently 11 Dec 2018, 06:46

### 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

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

# If d-3n/7n-d=1

Author Message
TAGS:
Moderator
Joined: 18 Apr 2015
Posts: 5130
Followers: 77

Kudos [?]: 1029 [0], given: 4636

If d-3n/7n-d=1 [#permalink]  29 Dec 2016, 09:19
Expert's post
00:00

Question Stats:

75% (00:48) correct 25% (01:40) wrong based on 8 sessions
If $$\frac{d-3n}{7n-d}=1$$, which of the following must be true about the relationship between d and n ?

(A) n is 4 more than d

(B) d is 4 more than n

(C) n is $$\frac{7}{3}$$ of d

(D) d is 5 times n

(E) d is 2 times n
[Reveal] Spoiler: OA

_________________
Director
Joined: 03 Sep 2017
Posts: 521
Followers: 1

Kudos [?]: 330 [0], given: 66

Re: If d-3n/7n-d=1 [#permalink]  29 Sep 2017, 06:53
The idea here is to solve the equation until we get d on one side of the equal sign and n on the other.

Then, $$\frac{d-3n}{7n-d}-1=0$$. Taking the MCM, we get $$\frac{d-3n-7n+d}{7n-d}=0$$. Getting rid of the deniminator and simplyfing we get $$d=5n$$. Thus, d is 5 times n.

Re: If d-3n/7n-d=1   [#permalink] 29 Sep 2017, 06:53
Display posts from previous: Sort by