problem to solve

Expert replies

Atult718: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Wed Mar 14, 2007 1:17 am

by Atult718 » Tue Apr 17, 2007 5:06 am

Q: Which of the following is equal to the value of
2^5+2^5+3^5+3^5+3^5

A) 5^6
B) 13^5
C) 2^6+3^6
D) 2^7+3^8
E) 4^5+9^5

what would be the right way to go about this ?

Like this post

Source: Beat The GMAT — Problem Solving | Tue Apr 17, 2007 5:06 am

rajesh_ctm: Master | Next Rank: 500 Posts; Posts: 135; Joined: Tue Feb 27, 2007 7:21 pm; Thanked: 2 times

by rajesh_ctm » Tue Apr 17, 2007 4:15 pm

Simplify it as
a+a+b+b+b
where a=2^5 and b=3^5

So the expression is 2a+3b = 2*2^5+3*3^5 = 2^6+3^6.

Like this post

Atult718: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Wed Mar 14, 2007 1:17 am

by Atult718 » Tue Apr 17, 2007 11:00 pm

ohhhhhhhhhh... thanks man... very good explanation.

Like this post

GMAT/MBA Expert

Scott@TargetTestPrep: GMAT Instructor; Posts: 8177; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Mon May 20, 2019 6:11 pm

Atult718 wrote:Q: Which of the following is equal to the value of
2^5+2^5+3^5+3^5+3^5

A) 5^6
B) 13^5
C) 2^6+3^6
D) 2^7+3^8
E) 4^5+9^5

2^5+2^5+3^5+3^5+3^5

2^5(1 + 1) + 3^5(1 + 1 + 1)

2^5(2) + 3^5(3)

2^6 + 3^6

Answer: C

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 » Tue May 21, 2019 6:27 am

Atult718 wrote:Q: Which of the following is equal to the value of
2^5+2^5+3^5+3^5+3^5

A) 5^6
B) 13^5
C) 2^6+3^6
D) 2^7+3^8
E) 4^5+9^5

What we really have here is an algebra question requiring us to combine like terms.

First, notice that K + K = 2K
Using the same logic, 2^5 + 2^5 = 2(2^5) = (2^1)(2^5) = 2^6

Similarly, notice that M + M + M = 3M
Using the same logic, 3^5 + 3^5 + 3^5 = 3(3^5) = (3^1)(3^5) = 3^6

So, 2^5 + 2^5 + 3^5 + 3^5 + 3^5 = 2^6 + 3^6

Answer: C

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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