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
Vote for Target Test Prep, Newsweek Readers’ Choice Awards 2026
NEWSWEEK READERS’ CHOICE 2026

BIG NEWS! Target Test Prep has been nominated, and they’d love your vote!

TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.

Vote for TTP
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
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
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.

715+ 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.

Work/Rate

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 172
Joined: Fri Oct 21, 2011 9:10 pmFollowed by: 2 members
Thanked: 7 times
by satishchandra » Tue Dec 27, 2011 1:58 am
Two consultants can type up a report in 12.5 hours and edit it in 7.5 hours. If Mary needs 30 hours to type the report and Jim needs 12 hours to edit it alone, how many hours will it take if Jim types the report and Mary edits it immediately after he is done?

(A) 41.4
(B) 34.1
(C) 13.4
(D) 12.4
(E) 10.8

I know this is a simple problem. It took appx 3 mins for me to solve, and I thought my appoach was lengthy.
I could eliminate (c), (D), (E) in just 20 seconds but painfully had to go for complete solution to pick right option between A and B.
I will appreciate if anyone could post quicker approach.
For those who excite about knowing OA, IT's A
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members
Location: Milpitas, CA
Thanked: 1854 times
GMAT Score:770

by Anurag@Gurome » Tue Dec 27, 2011 2:17 am
satishchandra wrote:Two consultants can type up a report in 12.5 hours and edit it in 7.5 hours. If Mary needs 30 hours to type the report and Jim needs 12 hours to edit it alone, how many hours will it take if Jim types the report and Mary edits it immediately after he is done?

(A) 41.4
(B) 34.1
(C) 13.4
(D) 12.4
(E) 10.8

I know this is a simple problem. It took appx 3 mins for me to solve, and I thought my appoach was lengthy.
I could eliminate (c), (D), (E) in just 20 seconds but painfully had to go for complete solution to pick right option between A and B.
I will appreciate if anyone could post quicker approach.
For those who excite about knowing OA, IT's A
Let Jim types the report in x hours and let Mary type the report in y hours.
1/x + 1/y = 1/12.5
1/x + 1/30 = 1/12.5
(30 + x)/30x = 1/12.5
375 + 12.5x = 30x
375 = 17.5x
x = 150/7

Let Jim edits the report in a hours and let Mary edit the report in b hours.
1/a + 1/b = 1/7.5
1/12 + 1/b = 1/7.5
b + 12 = 12b/7.5
7.5b + 90 = 12b
90 = 4.5b
b = 20

Therefore, time taken by Jim to type the report and for Mary to edit it = 150/7 + 20 = 41.4

The correct answer is A.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1084
Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members
Thanked: 158 times

by pemdas » Tue Dec 27, 2011 2:45 am
1/30 + 1/J=1/12.5
1/M + 1/12=1/7.5 solve for M (speed EDITS) and J (speed TYPES)

(when one types the other is unknown, the same with edition done)

1/J=2/25-1/30=14/300=7/150 (150/7 Jim needs to type) <- tip: reciprocal for time/work conversion
1/M=2/15-1/12=3/60=1/20 (20 hours Mary need to edit) <- tip: reciprocal for time/work conversion

combined time (20+21.4)=41.4 hours

ans.A
satishchandra wrote:Two consultants can type up a report in 12.5 hours and edit it in 7.5 hours. If Mary needs 30 hours to type the report and Jim needs 12 hours to edit it alone, how many hours will it take if Jim types the report and Mary edits it immediately after he is done?

(A) 41.4
(B) 34.1
(C) 13.4
(D) 12.4
(E) 10.8

I know this is a simple problem. It took appx 3 mins for me to solve, and I thought my appoach was lengthy.
I could eliminate (c), (D), (E) in just 20 seconds but painfully had to go for complete solution to pick right option between A and B.
I will appreciate if anyone could post quicker approach.
For those who excite about knowing OA, IT's A
Success doesn't come overnight!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 626
Joined: Fri Dec 23, 2011 2:50 amFollowed by: 10 members
Location: Ahmedabad
Thanked: 31 times

by ronnie1985 » Tue Dec 27, 2011 3:38 am
The question can be solved effectively by table:-

Type Edit Time Taken by The Question
Mary 0.03 0.05 20
Jim 0.05 0.083333333 21.42857143
Total 0.08 0.133333333
Total Time = 41.42857143
Follow your passion, Success as perceived by others shall follow you
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 73
Joined: Sat Nov 27, 2010 1:40 pm
Thanked: 1 times

by happymanocha » Tue Dec 27, 2011 8:19 am
Here is how i will solve the problem:
From first statement: 1/30+1/JT=2/25
From 2nd statement: 1/12+1/ME=2/15
Sum of first and 2nd statement = 1/30+1/12+1/JT+1/ME=2/25+2/15

1/JT+1/ME=87/900

What we need to calculate is reciprocal of it i.e 900/87.

Ans: [color=white]A[/color]
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1