GMAT Prep Math Practice Test Question

Expert replies

damrkstr: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Sun Nov 02, 2008 3:55 pm

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.

Source: Beat The GMAT — Problem Solving | Sun Nov 02, 2008 4:16 pm

dmateer25: Community Manager; Posts: 1049; Joined: Sun Apr 06, 2008 5:15 pmFollowed by: 27 members; Location: Pittsburgh, PA; Thanked: 113 times; 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

logitech: Legendary Member; Posts: 2134; Joined: Mon Oct 20, 2008 11:26 pmFollowed by: 25 members; Thanked: 237 times; 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
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vishubn: 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

GMAT dreamer: 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.

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