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

Redeem

kindly solve it by giving explanation.......

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Critical Reasoning |
Newbie | Next Rank: 10 Posts
Posts: 9
Joined: Thu Oct 16, 2008 3:17 am
Thanked: 1 times

[

by Alfred » Mon Dec 28, 2009 12:41 am
good question[/list]
Last edited by Alfred on Mon Mar 22, 2010 11:47 pm, edited 1 time in total.
Top
Legendary Member
Posts: 869
Joined: Wed Aug 26, 2009 3:49 pm
Location: California
Thanked: 13 times
Followed by:3 members

by heshamelaziry » Mon Dec 28, 2009 1:05 am
IMO C
Top
User avatar
Legendary Member
Posts: 1560
Joined: Tue Nov 17, 2009 2:38 am
Thanked: 137 times
Followed by:5 members

by thephoenix » Tue Dec 29, 2009 5:56 am
1/a + 1/b=(b+a)/ab=6----->ab=(a+b)/6=12/6=2
Top
Newbie | Next Rank: 10 Posts
Posts: 9
Joined: Thu Oct 16, 2008 3:17 am
Thanked: 1 times

by Alfred » Mon Mar 22, 2010 11:55 pm
Look,
1/a + 1/b = (a+b)/2
(b+a)/ab = (a+b)/2
simply, ab = 2

if i talk about my opinion then according to me you should to visit to that particular site where from you found this question, because i have also seen these type problem on https://www.TestCircle.com/GMAT FREE SAMPLE VIDEOS, and i found that it was described in a simple and understanding way.
Top
Master | Next Rank: 500 Posts
Posts: 232
Joined: Sun Feb 28, 2010 10:47 pm
Thanked: 10 times

by Phirozz » Tue Mar 23, 2010 12:23 am
Mod !!

Could u plz shift this question to QA thread
Top
User avatar
Legendary Member
Posts: 1261
Joined: Sun Sep 14, 2008 3:46 am
Thanked: 27 times
GMAT Score:570

by reply2spg » Tue Mar 23, 2010 8:14 am
Answer is C. however, this question should be in quant section.

ok here is the solution.

(1/a) +(1/b) = 6
Find out the LCM of both fractions. it is 'ab'. multiply by 'b' to first term and by 'a' to second term. final result will be

[(a+b)/ab] = 6.

We know that a+b =12. replace a+b with 12 in the equation.

[12/ab] = 6. Move 'ab' to right hand side and '6' to left hand side.

(12/6) = ab. Therefore, ab = 2 (C)
testcircle wrote:If a+b = 12, and 1/a + 1/b= 6, then what should be the value of ab


(A) 1/2
(B) -3
(C) 2
(D) -2
(E) 1/6

I have seen this problem on www.TC.com/GRE, in sample questions. kindly solve it by an another method

Looking for a good reply.
[/b]
Top
Post new topic Post Reply
• Page 1 of 1