percentages

This topic has expert replies
User avatar
Senior | Next Rank: 100 Posts
Posts: 72
Joined: Tue Apr 19, 2011 6:58 am
Followed by:6 members

percentages

by jayanti » Tue Aug 02, 2011 11:25 pm
The population of City X is 50 percent of the population of City Y. The population of City X is what percent of the total population of City X and City Y?
Source: — Problem Solving |

User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pm
Location: New York, NY
Thanked: 13060 times
Followed by:1906 members
GMAT Score:790

by GMATGuruNY » Wed Aug 03, 2011 2:11 am
jayanti wrote:The population of City X is 50 percent of the population of City Y. The population of City X is what percent of the total population of City X and City Y?
Let Y = 2.
Then X = (.5)*2 = 1.
X/(X+Y) = 1/(1+2) = 1/3 = 33.33%.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3

User avatar
Legendary Member
Posts: 1022
Joined: Mon Jul 20, 2009 11:49 pm
Location: Gandhinagar
Thanked: 41 times
Followed by:2 members

by shashank.ism » Wed Aug 03, 2011 4:37 am
jayanti wrote:The population of City X is 50 percent of the population of City Y. The population of City X is what percent of the total population of City X and City Y?
Let X, Y be population of city X & Y respectively.
Also X= 50/100).Y = 0.5 Y
so population of city X is {X/(X+Y)}.100 = (0.5Y/1.5Y).100 = 33.33% of total population of City X and City Y.
My Websites:
www.mba.webmaggu.com - India's social Network for MBA Aspirants

www.deal.webmaggu.com -India's online discount, coupon, free stuff informer.

www.dictionary.webmaggu.com - A compact free online dictionary with images.

Nothing is Impossible, even Impossible says I'm possible.