BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

GMAT Prep Math Practice Test Question

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 2
Joined: Sun Nov 02, 2008 3:55 pm

GMAT Prep Math Practice Test Question

by damrkstr » Sun Nov 02, 2008 4:16 pm
Hi. I am going through my wrong answers from the 1st practice test on the GMAT Prep CD, and was hoping someone could help me out with some since there are no explanations on there.

1. Which of the following is equal to the value of 2^5 +2^5 + 3^5 + 3^5 + 3^5? and the answer was [spoiler]2^6 + 3^6[/spoiler]
I know that this is correct but are there any quick rules/techniques that can help get you to this answer faster? I know all of the multiplication exponent rules but they don't apply here.

Thanks. I am sure I'll be asking more questions on here.
Top
Source: — Problem Solving |
User avatar
Community Manager
Posts: 1049
Joined: Sun Apr 06, 2008 5:15 pm
Location: Pittsburgh, PA
Thanked: 113 times
Followed by:27 members
GMAT Score:710

by dmateer25 » Sun Nov 02, 2008 4:43 pm
The rule for this is:

a^x + a^x = 2(a^x)
a^x + a^x + a^x = 3(a^x)


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

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

2^6 + 3^6
Top
User avatar
Legendary Member
Posts: 2134
Joined: Mon Oct 20, 2008 11:26 pm
Thanked: 237 times
Followed by:25 members
GMAT Score:730

Re: GMAT Prep Math Practice Test Question

by logitech » Sun Nov 02, 2008 5:42 pm
damrkstr wrote:Hi. I am going through my wrong answers from the 1st practice test on the GMAT Prep CD, and was hoping someone could help me out with some since there are no explanations on there.

1. Which of the following is equal to the value of 2^5 +2^5 + 3^5 + 3^5 + 3^5? and the answer was [spoiler]2^6 + 3^6[/spoiler]
I know that this is correct but are there any quick rules/techniques that can help get you to this answer faster? I know all of the multiplication exponent rules but they don't apply here.

Thanks. I am sure I'll be asking more questions on here.
Guys make sure that you know the FUNDAMENTALS of basic math like inside of your palm.

Manhattan GMAT books will help you.
LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
Top
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times

by vishubn » Tue Nov 04, 2008 5:23 am
My Key to this kinda problem is to always find the common factor ! and reduce the given as much as possible !

believe me it works .. u do few problems on the same lane u will know wat exactly i mean :)

Infact u start liking it !! always look for the similar powers to take coomon factor out or to cancel out or bring similar powers on the same equation

Vishu
Top
Junior | Next Rank: 30 Posts
Posts: 10
Joined: Tue Nov 04, 2008 1:25 pm

by GMAT dreamer » Tue Nov 18, 2008 12:53 pm
The rule is x² + x² = 2x². Like terms.
Top
Post new topic Post Reply
• Page 1 of 1