Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 19 Jun 2013, 17:17

# Which of the following best approximates the value of q if

Author Message
TAGS:
VP
Joined: 30 Jun 2008
Posts: 1050
Followers: 8

Kudos [?]: 215 [0], given: 1

Which of the following best approximates the value of q if [#permalink]  02 Nov 2008, 02:36
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Which of the following best approximates the value of q if 5^28+3^11=5^q ?

A 39
B 30
C 28
D 27
E 17
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Check out my GMAT blog - GMAT Tips and Strategies

SVP
Joined: 17 Jun 2008
Posts: 1592
Followers: 7

Kudos [?]: 132 [0], given: 0

Re: PS : Approximation [#permalink]  02 Nov 2008, 02:54
3^3 could approximately equal 5^2
Hence, 3^11 approximately equals 5^6*5 = 5^7

Hence, 5^28 + 5^7 = 5^7(5^21 + 1)
We can ignore 1 within the bracket and approximate value will be 5^28.

Hence, q should be 28.
Director
Joined: 23 May 2008
Posts: 842
Followers: 3

Kudos [?]: 19 [0], given: 0

Re: PS : Approximation [#permalink]  02 Nov 2008, 02:57
3^11 is a small number compared to 5^28. Given the answer choices, C is the best answer
Re: PS : Approximation   [#permalink] 02 Nov 2008, 02:57
Similar topics Replies Last post
Similar
Topics:
Which of the following best approximates the value of q if 12 08 Aug 2006, 18:43
Which of the following best approximates the value of q if 8 01 Nov 2007, 16:06
2 Which of the following best approximates the value of q if 3 23 Jan 2008, 16:27
Which of the following best approximates the value of q if 4 28 Aug 2008, 16:28
2 Which of the following best approximates the value of q if 6 23 Aug 2010, 09:32
Display posts from previous: Sort by