Positive integer y is 50 percent of 50 percent of positive

Oldest

Best Reply

Author

Message

TAGS:

Manager

Joined: 27 Feb 2010

Posts: 107

Location: Denver

Followers: 1

Kudos [?]: 70 [0], given: 14

Positive integer y is 50 percent of 50 percent of positive [#permalink]

27 Apr 2010, 16:01

00:00

Question Stats:

84% (02:06) correct

15% (01:41) wrong

based on 4 sessions

Positive integer y is 50 percent of 50 percent of positive integer x, and y percent of x equals 100. what is the value of x ?

A) 50
B) 100
C) 200
D) 1000
E) 2000

Official Guide 12 Question

Question: 12
Page: 22
Difficulty: 700

Find All Official Guide Questions

Video Explanations:

[Reveal] Spoiler: OA

Last edited by zz0vlb on 27 Apr 2010, 16:29, edited 1 time in total.

Kaplan Promo Code

Knewton GMAT Discount Codes

GMAT Pill GMAT Discount Codes

GMAT Club team member

Joined: 02 Sep 2009

Posts: 11516

Followers: 1792

Kudos [?]: 9536 [0], given: 826

Re: 50 percent of 50 percent of positive integer [#permalink]

27 Apr 2010, 16:10

zz0vlb wrote:

Positive integer y is 50 percent of 50 percent of positive integer x, and y percent of x equals 100. what is the value of x ?

A. 50
B. 100
C. 200
D. 1000
E. 2000

\sqrt{C - OG12}

I already solved it. Posting this for others who needs practice.

Given: x>0 and y>0.
"Positive integer y is 50 percent of 50 percent of positive integer x" --> y=0.5*(0.5x)=0.25x
"y percent of x equals 100" --> \frac{y}{100}*x=100 --> xy=100*100 --> substitute y --> x^2=4*100*100 --> as x>0, only one solution x=200.

Answer: C.
_________________

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!

What are GMAT Club Tests?
25 extra-hard Quant Tests

Find out what's new at GMAT Club - latest features and updates

Re: 50 percent of 50 percent of positive integer [#permalink] 27 Apr 2010, 16:10

		Similar topics	Author	Replies	Last post
Similar Topics:		Set A contains 50 different positive integers, the	kevincan	7	12 Jul 2006, 16:31
		If x and y are positive numbers and z = xy^2, a 50 percent	Whatever	5	22 Mar 2007, 07:26
		If r and s are positive integer r is what percent of s ? 1.	saviop	5	22 Nov 2007, 17:56
	1	Positive integer y is 50 percent of 50 percent of positive	Bunuel	9	02 Jul 2012, 02:05
	4	If X is the sum of first 50 positive even integers and Y is	nishtil	11	11 Sep 2012, 05:11

Positive integer y is 50 percent of 50 percent of positive

Main navigation

GMAT Resources

Partners

MBA Resources

GMAT ® is a registered trademark of the Graduate Management Admission Council ® (GMAC ®). GMAT Club's website has not been reviewed or endorsed by GMAC.

GMAT Courses

Admissions Consulting

Positive integer y is 50 percent of 50 percent of positive

Positive integer y is 50 percent of 50 percent of positive

Main navigation

GMAT Resources

Partners

MBA Resources