GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 12 Dec 2018, 22:41

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.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • The winning strategy for 700+ on the GMAT

     December 13, 2018

     December 13, 2018

     08:00 AM PST

     09:00 AM PST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.
  • GMATbuster's Weekly GMAT Quant Quiz, Tomorrow, Saturday at 9 AM PST

     December 14, 2018

     December 14, 2018

     09:00 AM PST

     10:00 AM PST

    10 Questions will be posted on the forum and we will post a reply in this Topic with a link to each question. There are prizes for the winners.

Question about X percent

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Intern
Intern
avatar
B
Joined: 17 Jun 2018
Posts: 6
Question about X percent  [#permalink]

Show Tags

New post 16 Jul 2018, 09:39
I often get confused when a word problem includes the words "x percent" as a variable and often the question asks to express the answer in terms of x.

Am I suppose to assume that x is an integer such as 50 as opposed to 50% or 0.50? E.g. If it's 50 percent, then x is 50. When I work the problem, should I use x/100 in place of "x percent" or use 0.x?

Also when do we need to multiple the answer by 100 at the end to express it as a percent?
Director
Director
User avatar
G
Status: Tutor - BrushMyQuant
Joined: 05 Apr 2011
Posts: 610
Location: India
Concentration: Finance, Marketing
Schools: XLRI (A)
GMAT 1: 700 Q51 V31
GPA: 3
WE: Information Technology (Computer Software)
Re: Question about X percent  [#permalink]

Show Tags

New post 16 Jul 2018, 19:10
1
Top Contributor
As a rule of thumb, start using x percentage (or any percentage) as x/100 and then you will not see any problem.
When the question is asking you about percentage increase then you need to do ((increase)/Initial value) * 100
When the question is asking you about percentage decrease then you need to do ((decrease)/Initial value) * 100

Example:

1. 50% of a is b

lets break down each and every word
50% -> 50/100
of -> *
a -> a
is -> =
b -> b
so, in total we have
(50/100) * a = b

2. x% of y is z

lets break down each and every word
x% -> x/100
of -> *
y -> y
is -> =
z -> z
so, in total we have
(x/100) * y = z

3. x is what percent greater than y
Let's take x is t% greater than y
lets break down each and every word
x% -> x/100
is -> =
t% greater than-> (1 + (t/100))
y -> y
so, in total we have
x = (1 + (t/100)) * y
Simplifying
x/y = 1 + (t/100)
(t/100) = 1 - x/y
t = (y-x)*100/y

Hope it helps!
lilypond789 wrote:
I often get confused when a word problem includes the words "x percent" as a variable and often the question asks to express the answer in terms of x.

Am I suppose to assume that x is an integer such as 50 as opposed to 50% or 0.50? E.g. If it's 50 percent, then x is 50. When I work the problem, should I use x/100 in place of "x percent" or use 0.x?

Also when do we need to multiple the answer by 100 at the end to express it as a percent?

_________________

Ankit

Check my Tutoring Site -> Brush My Quant

GMAT Quant Tutor
How to start GMAT preparations?
How to Improve Quant Score?
Gmatclub Topic Tags
Check out my GMAT debrief

How to Solve :
Statistics || Reflection of a line || Remainder Problems || Inequalities

Intern
Intern
avatar
B
Joined: 17 Jun 2018
Posts: 6
Re: Question about X percent  [#permalink]

Show Tags

New post 16 Jul 2018, 21:06
Very helpful! Thanks for breaking it down.
GMAT Club Bot
Re: Question about X percent &nbs [#permalink] 16 Jul 2018, 21:06
Display posts from previous: Sort by

Question about X percent

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

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

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.