The numbers of products a store sold on...

Expert replies

BTGmoderatorLU: Moderator; Posts: 2544; Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members

by BTGmoderatorLU » Sat Oct 28, 2017 8:31 am

The numbers of products a store sold on 4 consecutive days were x, x + 5, x + 3 and x + 12. If the daily average of the products sold was 13, what is the value of x?

A.4
B.6
C.7
D.8
E.12

The OA is D.

Can any expert explain this PS question, please? Thanks.

Like this post

Source: Beat The GMAT — Problem Solving | Sat Oct 28, 2017 8:31 am

GMAT/MBA Expert

[email protected]: Elite Legendary Member; Posts: 10392; Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members; Location: Palo Alto, CA; Thanked: 2867 times; GMAT Score:800

by [email protected] » Sat Oct 28, 2017 10:38 am

Hi LUANDATO,

There are a couple of ways to approach this question, but you'll likely find it easiest to just do the Algebra.

We're told that the AVERAGE number of products sold over 4 days is 13. This means that (4)(13) = 52 total products were sold.

The 4 sales totals are (X), (X+5), (X+3) and (X+12)... which gives us total of 4X + 20. We're asked to solve for the value of X.

4X + 20 = 52
4X = 32
X = 8

Final Answer: D

GMAT assassins aren't born, they're made,
Rich

Contact Rich at [email protected]

Like this post

GMAT/MBA Expert

Scott@TargetTestPrep: GMAT Instructor; Posts: 8138; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Tue Nov 12, 2019 7:18 pm

BTGmoderatorLU wrote:The numbers of products a store sold on 4 consecutive days were x, x + 5, x + 3 and x + 12. If the daily average of the products sold was 13, what is the value of x?

A.4
B.6
C.7
D.8
E.12

The OA is D.

Can any expert explain this PS question, please? Thanks.

We create the equation:

(x + x + 5 + x + 3 + x + 12)/4 = 13

4x + 20 = 52

4x = 32

x = 8

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

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 » Wed Nov 13, 2019 7:11 am

BTGmoderatorLU wrote:The numbers of products a store sold on 4 consecutive days were x, x + 5, x + 3 and x + 12. If the daily average of the products sold was 13, what is the value of x?

A.4
B.6
C.7
D.8
E.12

GIVEN: Average of the 4 values = 13
We can write: [x + (x+5) + (x+3) + (x + 12)/4 = 13
Multiply both sides by 4 to get: x + (x+5) + (x+3) + (x + 12) = 52
Simplify to get: 4x + 20 = 52
Subtract 20 from both sides: 4x = 32
Solve: x = 8
Answer: D

Cheers,
Brebt

Brent Hanneson - Creator of GMATPrepNow.com

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

559 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