In the multiplication above, # represents a single digit.

Expert replies

Previous Topic Next Topic

Gmat_mission: Legendary Member; Posts: 1622; Joined: Thu Mar 01, 2018 7:22 amFollowed by: 2 members

by Gmat_mission » Mon Jun 10, 2019 5:00 am

Timer

00:00

Answers

Stats

Difficulty—

In the multiplication above, # represents a single digit. What digit does # represent?

A. 2
B. 3
C. 4
D. 5
E. 6

[spoiler]OA=D[/spoiler]

Source: Princeton Review

Like this post

Source: Beat The GMAT — Problem Solving | Mon Jun 10, 2019 5:00 am

GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Mon Jun 10, 2019 9:53 am

Gmat_mission wrote:
In the multiplication above, # represents a single digit. What digit does # represent?

A. 2
B. 3
C. 4
D. 5
E. 6

We're told that # times 512 equals two thousand and something.
Well, 4 times 512 = two thousand and something.
And 5 times 512 = two thousand and something.
No other digits, when multiplied by 512 will give us two thousand and something

So, let's test 4 and 5 (answer choices C and D)

If # = 4, we get: (4)(510) = 2040 (doesn't meet the condition that the product is 2##0. ELIMINATE C

f # = 5, we get: (5)(510) = 2550.
Perfect! This meets the condition that the product is 2##0.

Answer: D

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

Like this post

GMAT/MBA Expert

Scott@TargetTestPrep: GMAT Instructor; Posts: 8151; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Tue Jun 11, 2019 7:13 pm

Gmat_mission wrote:
In the multiplication above, # represents a single digit. What digit does # represent?

A. 2
B. 3
C. 4
D. 5
E. 6

[spoiler]OA=D[/spoiler]

Source: Princeton Review

We see that when a number in the low 500s is multiplied by a single digit number, the product is in the 2000s. Therefore, that single digit number must be either 4 or 5.

If it's 4, then we have 510 x 4 = 2040. However, this is not correct, given that the pound sign (#) can only represent one unique digit.

If it's 5, then we have 510 x 5 = 2550. We see that the pound sign must be 5.

Answer: D

Scott Woodbury-Stewart
Founder and CEO
[email protected]

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review