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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

ratio

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 1169
Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member
Thanked: 25 times
by aj5105 » Mon Jul 20, 2009 8:24 am
The ratio of boys to girls in Class A is 3 to 4. The ratio of boys to girls in Class B is 4 to 5. If the two classes were combined, the ratio of boys to girls in the combined class would be 17 to 22. If the number of boys in Class B is one less than the number of boys in Class A, and if the number of girls in Class B is two less than the number of girls in Class A, how many girls are in Class A?

8
9
10
11
12

I got answer without using the ratio 17:22.

4y = 3x -1
5y = 4x -2

solve and answer. please validate my method.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 392
Joined: Thu Jan 15, 2009 12:52 pm
Location: New Jersey
Thanked: 76 times

by truplayer256 » Mon Jul 20, 2009 8:44 am
Class A: B/G=3/4

Class B: b/g=4/5

B+b/G+g=17/22

b=B-1

g=G-2

2B-1/2G-2=17/22

4B=3G

2B=3G/2

3G/2-1/2G-2=17/22

33G-22=34G-34

G=12

E

I don't really understand the method that you used.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 345
Joined: Wed Mar 18, 2009 6:53 pm
Location: Sao Paulo-Brazil
Thanked: 12 times
GMAT Score:660

by shibal » Mon Jul 20, 2009 8:48 am
OA???
IMO 12
I did it in 45 sec. By getting one of the the answers. As 3b=4g, i chose a multiple of 4, so 12 would feet... Backsolve and you get the answer... I think by doing setp-by-step ratio will take at least 1.30 min
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 166
Joined: Sat Apr 18, 2009 10:41 pm
Thanked: 9 times
GMAT Score:770

Re: ratio

by raghavsarathy » Tue Jul 21, 2009 7:45 am
aj5105 wrote:The ratio of boys to girls in Class A is 3 to 4. The ratio of boys to girls in Class B is 4 to 5. If the two classes were combined, the ratio of boys to girls in the combined class would be 17 to 22. If the number of boys in Class B is one less than the number of boys in Class A, and if the number of girls in Class B is two less than the number of girls in Class A, how many girls are in Class A?

8
9
10
11
12

I got answer without using the ratio 17:22.

4y = 3x -1
5y = 4x -2

solve and answer. please validate my method.
Your method was awesome.. We really dont need the 17: 22 ratio. We have 2 ratios and we have 2 more conditions given to solve this. It is more than sufficient.

I used the 17/22 ratio and was wondering as to why they gave 2 relations between number of boys and girls of the two classes. I guess your method answers my question.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 179
Joined: Tue Jan 08, 2008 7:23 pm
Thanked: 11 times
GMAT Score:590

by nitya34 » Tue Jul 21, 2009 8:09 am
Class A--(3k1,4k1) and Class B--(4k2,5k2)

eqn is

(3k1+4k2)/(4k2+5k2) = 17/22--------------(A)

given is 4k2+1=3k1; 5k2+2=4k1

now replace 4k2 and 5k2 into main Eqn (A)

and find 4k1=12(hence E)
Many of the great achievements of the world were accomplished by tired and discouraged men who kept on working.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 179
Joined: Tue Jan 08, 2008 7:23 pm
Thanked: 11 times
GMAT Score:590

by nitya34 » Tue Jul 21, 2009 8:11 am
is this a GMAT type Q?
Many of the great achievements of the world were accomplished by tired and discouraged men who kept on working.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1