BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

pt questions

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 53
Joined: Thu Apr 12, 2007 12:32 am
Thanked: 1 times
by jc114 » Mon May 07, 2007 7:23 am
If x and y are positive numbers and z=xy^2, a 50 % increase in x and a 20% decrease in y would result in which of the following changes in z?
A. decrease of 4%
B. decrease of 14%
C. increase of 4%
D. increase of 20%
E. increase of 30%

If n is an integer, which of the following cannot be a factor of 3n+4?
A. 4
B. 5
C. 6
D. 7
E. 8
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 105
Joined: Mon Sep 18, 2006 12:34 pm
Location: OH
Thanked: 7 times
GMAT Score:780

by mschling52 » Mon May 07, 2007 7:40 am
(1) A - decrease of 4%

50% increase in x = 1.5x
20% decrease in y = 0.8y

Plug these into the equation for z (z=xy^2) and we have

1.5x*(0.8y)^2 = (1.5)(0.64)xy^2 = 1.5(0.64)z = 0.96z,

so we have a 4% decrease in z.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 559
Joined: Tue Mar 27, 2007 1:29 amFollowed by: 2 members
Thanked: 5 times

by Cybermusings » Mon May 07, 2007 9:28 am
If x and y are positive numbers and z=xy^2, a 50 % increase in x and a 20% decrease in y would result in which of the following changes in z?
A. decrease of 4%
B. decrease of 14%
C. increase of 4%
D. increase of 20%
E. increase of 30%

If n is an integer, which of the following cannot be a factor of 3n+4?
A. 4
B. 5
C. 6
D. 7
E. 8

In the first question there should be an decrease of 4%
For the second question its not possible for 6 to be a factor of 3n+4
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1