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

Redeem

Ratio

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 324
Joined: Mon Jul 05, 2010 6:44 am
Location: London
Thanked: 70 times
Followed by:3 members

by kmittal82 » Tue Oct 25, 2011 5:09 am
Should be (A), here's what I did

x:y = 10a/3b = 10/3. This ,means a = b.
Similarly, y:z = 3b/7c = 3/7. This means b =c

Now, the expression is
(7x+2y+5z)/(8a+b+3c)

Numerator, when expanded becomes 70a + 6b + 35c
Denominator, is 8a + b + 3c

Since a = b = c, The ratio thus becomes 111/12

OA please?
Top
Master | Next Rank: 500 Posts
Posts: 401
Joined: Tue May 24, 2011 1:14 am
Thanked: 37 times
Followed by:5 members

by MBA.Aspirant » Tue Oct 25, 2011 5:13 am
A is correct
Top
User avatar
Community Manager
Posts: 1060
Joined: Fri May 13, 2011 6:46 am
Location: Utrecht, The Netherlands
Thanked: 318 times
Followed by:52 members

by neelgandham » Tue Oct 25, 2011 5:17 am
x =10a; y = 3b;z =7c
Substitute a=b=c=1, you get x=10,y=3,z=7
The expression is(7x+2y+5z)/(8a+b+3c) = (70+6+35)/(8+1+3) = 111/12 Answer : A
Anil Gandham
Welcome to BEATtheGMAT | Photography | Getting Started | BTG Community rules | MBA Watch
Check out GMAT Prep Now's online course at https://www.gmatprepnow.com/
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 359
Joined: Wed Mar 11, 2009 4:37 am
Location: Kolkata, India
Thanked: 50 times
Followed by:2 members

by Abhishek009 » Tue Oct 25, 2011 9:26 am
MBA.Aspirant wrote:Thanks ahead
x =10a; y = 3b;z =7c

Again x : y : z = 10 : 3 : 7


So, 10a = 10 , 3b = 3 & 7c = 7


Hence , a = b = c = 1


So , x = 10 , y = 3 and z = 7

Now we have to find -

(7x+2y+5z)/(8a+b+3c)

7*10 + 2*3 + 5*7 / 8*1 + 1 + 3*1

70+6+35 / 12

111/12


So option A will be the answer...
Abhishek
Top
Post new topic Post Reply
• Page 1 of 1