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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Tricky Systems of Equations (3) Problem

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 162
Joined: Sun Aug 09, 2009 4:17 pm
Location: Minnesota
Thanked: 1 times
by EMAN » Thu Nov 12, 2009 8:00 pm
Andrew will be half as old as Larry in 3 years. Andrew will also be one-third as old as Jerome in 5 years. If Jerome is 15 years older than Larry, how old is Andrew?

Please show work and strategy. I got a little confused manipulating the three equations and the explanation is the Manhattan guide is overly tedious in my opinion.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 256
Joined: Mon Aug 10, 2009 6:31 pm
Thanked: 3 times

by gmatv09 » Thu Nov 12, 2009 8:11 pm
A+3 = 1/2 (L+3) ==> 2A+6 = 3 + L

A+5 = 1/3 (J+5) ==> 3A+15 = 20 +L

================
A + 9 = 17
A = 8
J = 15+L
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 162
Joined: Sun Aug 09, 2009 4:17 pm
Location: Minnesota
Thanked: 1 times

Great

by EMAN » Thu Nov 12, 2009 8:22 pm
That's good. It looks like I had a few minor errors in my equation setup. Where is 20 + L coming from?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 162
Joined: Sun Aug 09, 2009 4:17 pm
Location: Minnesota
Thanked: 1 times

by EMAN » Thu Nov 12, 2009 8:28 pm
I would think that 3A + 15 = J + 15 (as opposed to L + 20) which I understand would make the equation work.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 199
Joined: Sat Oct 24, 2009 4:43 pm
Thanked: 22 times
GMAT Score:710

Re: Tricky Systems of Equations (3) Problem

by palvarez » Thu Nov 12, 2009 11:53 pm
EMAN wrote:Andrew will be half as old as Larry in 3 years. Andrew will also be one-third as old as Jerome in 5 years. If Jerome is 15 years older than Larry, how old is Andrew?

Please show work and strategy. I got a little confused manipulating the three equations and the explanation is the Manhattan guide is overly tedious in my opinion.
Create a grid or matrix like table, with rows for L, A, J, and with colums for today, today +3, today + 5. Just put all variables. Then come up with equations: this way, you wont get lost in a maze of variables, etc.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1