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
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
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.

715+ 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.

Unknown Digits - MGMAT

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 11
Joined: Sun Nov 03, 2013 2:35 pm
by itudor13 » Sun Jan 05, 2014 7:05 am
I have been struggling with unknown digits recently, and I was hoping the experts could help clear somethings up for me.

Here is a problem I struggled with:

(circle)(diamond)
x (square)(diamond)
(triangle)(square)(diamond)

In the multiplication above, each symbol represents a different unknown digit, and (circle)*(square)*(diamond)= 36. What is the three-digit integer (circle)(square)(diamond)

A)263
B)236
C)194
D)491
E)452

I understand how to eliminate the answers down to B and D because a diamond multiplied by a diamond equals a diamond. However, after this step, I don't know how to get to the right answer unless I multiply each answer out individually. This is time consuming and I'm not sure I would have enough time to do that.

Answer is B

Thank you in advance.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members
Location: New York, NY
Thanked: 13060 times
GMAT Score:790

by GMATGuruNY » Sun Jan 05, 2014 7:43 am
itudor13 wrote:I have been struggling with unknown digits recently, and I was hoping the experts could help clear somethings up for me.

Here is a problem I struggled with:

�♢
�♢
______
∆�♢

In the multiplication above, each symbol represents a different unknown digit, and � * � * ♢= 36. What is the three-digit integer ��♢?

A)263
B)236
C)194
D)491
E)452
We can PLUG IN THE ANSWERS, which represent the value of ��♢.
The multiplication example -- �♢ * �♢ = ∆�♢ -- implies that all 3 values have the same units digit.
The answer choices offer the following options for ♢:
3, 6, 4, 1, 2.
Of these options, only ♢=6 and ♢=1 are viable:
B: �6 * �6 = ∆�6
D: �1 * �1 = ∆�1.

Test answer choice B:
If ��♢ = 236, then � = 2, � = 3 and ♢ = 6.
Plugging these values into �♢ * �♢ = ∆�♢, we get:
26 * 36 = 936.
Success!

The correct answer is B.

To determine the correct answer, we had to test only one answer choice.
2 minutes should be sufficient time to perform the necessary calculations.
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
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1