equations - fractions - The Beat The GMAT Forum - Expert GMAT Help & MBA Admissions Advice

equations - fractions

Expert replies

Xbond: Master | Next Rank: 500 Posts; Posts: 275; Joined: Wed Jul 02, 2008 4:19 am; Thanked: 4 times

by Xbond » Thu Aug 07, 2008 9:37 am

If 1/x = 3.5. then 1/(x+2) =

a. 7/9
b. 16/7
c. 7/16
d. 9/7
e. 7/4

Someone can help and explain how to resolve quickly ?

Like this post

Source: Beat The GMAT — Problem Solving | Thu Aug 07, 2008 9:37 am

nitingupta5: Junior | Next Rank: 30 Posts; Posts: 21; Joined: Fri Jul 11, 2008 8:40 am; Thanked: 2 times

by nitingupta5 » Thu Aug 07, 2008 9:43 am

(1/x)+(1/2) = 4

1/(x+2) = 1/8x

1/(x+2) = 3.5/8

=7/16

Like this post

sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members; Location: INDIA; Thanked: 84 times

by sudhir3127 » Thu Aug 07, 2008 9:44 am

IMo C.

1/x = 7/2
hence x= 2/7

1/(x+2) = 1/(2/7 +2)

1/(16/7) = 7/16.

hope its clear

Like this post

pepeprepa: Legendary Member; Posts: 661; Joined: Tue Jul 08, 2008 12:58 pm; Location: France; Thanked: 48 times

by pepeprepa » Thu Aug 07, 2008 9:44 am

Find x with the first equation they give you
1/x=7/2
7x=2
x=2/7

And you reimplace it in what they ask you...
1/(x+2) = 1/ (2/7 + 2) = 1/( (2+14/7) )=1/(16/7)=7/16

Like this post

parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

by parallel_chase » Thu Aug 07, 2008 9:45 am

1/x =3.5 =7/2

x = 2/7

1/(x+2) = 1/ (2/7+2) = 1/ (16/7)=7/16

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review