Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
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.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

Help me please.

Expert replies
by Jheisra » Thu Jul 28, 2016 12:51 pm
Please answer this.
One number is three times another and their product is equal to their sum increases by fifty five find the number
Join the discussion
Source: — Problem Solving |

by [email protected] » Thu Jul 28, 2016 10:15 pm
Hi Jheisra,

What is the source of this question? Is it from a GMAT source or a 'math book?' I ask because the wording is clunky and you have not included the 5 answer choices. The math is based on Quadratic Algebra, so there are actually 2 solutions. As it stands, having those 5 answers would make solving this question REALLY easy. Without them though, we're almost forced to take a 'math heavy' approach.

With the information that we've been given, we can form the following equation (we can refer to the numbers as X and 3X):

(X)(3X) = (X+3X) + 55

3X^2 = 4X + 55

From here, we can solve Algebraically or use 'brute force' (and if we had 5 answer choices, then we could TEST THE ANSWERS).

Algebraically:
3X^2 - 4X - 55 = 0
(X - 5)(3X + 11) = 0
X = 5 or - 11/3

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
Image
Join the discussion

by regor60 » Fri Jul 29, 2016 6:56 am
And it seems likely by the wording that the "number" requested is then 15 or -11
Join the discussion

by Matt@VeritasPrep » Thu Aug 04, 2016 8:56 pm
[email protected] wrote:a 'math book?'
Do we mean an actual math book, or a phony math book? Seems like real math to me, no quotations required.
Join the discussion

by Matt@VeritasPrep » Thu Aug 04, 2016 8:59 pm
We've got

a = 3b

and

a*b = a + b + 55

so

3b² = 4b + 55

3b² - 4b - 55 = 0

(3b + 11)(b - 5) = 0

b = 5 or b = -11/3

from which

a = 15 or a = -11
Join the discussion