It is currently 25 Feb 2018, 11:49

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A can complete a certain job in 12 days. B is 60%

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

Hide Tags

Current Student
Joined: 25 Sep 2012
Posts: 281
Location: India
Concentration: Strategy, Marketing
GMAT 1: 660 Q49 V31
GMAT 2: 680 Q48 V34
A can complete a certain job in 12 days. B is 60% [#permalink]

Show Tags

02 Jun 2014, 06:09
1
KUDOS
2
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

68% (01:09) correct 32% (00:56) wrong based on 244 sessions

HideShow timer Statistics

A can complete a certain job in 12 days. B is 60% more efficient than A. In how many days can B complete the same job?

(A) 6
(B) 6.25
(C) 7
(D) 7.5
(E) 4.8

Kudos if you like the question..

[Reveal] Spoiler:
Little awkward explanation.60% more efficient means B can do 160% of work in same no. of days as A takes to do 100% of work.
160% work in 12 days
100% work in x days
x = $$\frac{(12*100)}{160}$$
[Reveal] Spoiler: OA
Math Expert
Joined: 02 Sep 2009
Posts: 43916
Re: A can complete a certain job in 12 days. B is 60% [#permalink]

Show Tags

02 Jun 2014, 06:29
Expert's post
4
This post was
BOOKMARKED
b2bt wrote:
A can complete a certain job in 12 days. B is 60% more efficient than A. In how many days can B complete the same job?

(A) 6
(B) 6.25
(C) 7
(D) 7.5
(E) 4.8

Kudos if you like the question..

[Reveal] Spoiler:
Little awkward explanation.60% more efficient means B can do 160% of work in same no. of days as A takes to do 100% of work.
160% work in 12 days
100% work in x days
x = $$\frac{(12*100)}{160}$$

B is 60% more efficient than A, means that the rate of B is 1.6 times as greater as that of A.

So, if A can complete the job in 12 days, then B complete the same job in 12/1.6 = 12/(8/5) = 15/2 = 7.5 days.

P.S. Not exactly a GMAT wording.
_________________
Retired Moderator
Joined: 29 Apr 2015
Posts: 888
Location: Switzerland
Concentration: Economics, Finance
Schools: LBS MIF '19
WE: Asset Management (Investment Banking)
Re: A can complete a certain job in 12 days. B is 60% [#permalink]

Show Tags

12 Jul 2015, 02:52
b2bt wrote:
A can complete a certain job in 12 days. B is 60% more efficient than A. In how many days can B complete the same job?

(A) 6
(B) 6.25
(C) 7
(D) 7.5
(E) 4.8

Kudos if you like the question..

[Reveal] Spoiler:
Little awkward explanation.60% more efficient means B can do 160% of work in same no. of days as A takes to do 100% of work.
160% work in 12 days
100% work in x days
x = $$\frac{(12*100)}{160}$$

Set up a Rate Time Work Table and plug in the values:

Rate / Time / Work for A:
12 / 12 / 144

Rate / Time / Work for B:
19.2 / 7.5 / 144

Do not fall into the trap by just working with the time, i.e. taking 60% off from 12 days and subtracting it from 12. Trap Answer E.
_________________

Saving was yesterday, heat up the gmatclub.forum's sentiment by spending KUDOS!

PS Please send me PM if I do not respond to your question within 24 hours.

SVP
Joined: 08 Jul 2010
Posts: 1960
Location: India
GMAT: INSIGHT
WE: Education (Education)
Re: A can complete a certain job in 12 days. B is 60% [#permalink]

Show Tags

12 Jul 2015, 05:05
1
KUDOS
Expert's post
3
This post was
BOOKMARKED
b2bt wrote:
A can complete a certain job in 12 days. B is 60% more efficient than A. In how many days can B complete the same job?

(A) 6
(B) 6.25
(C) 7
(D) 7.5
(E) 4.8

Alternate Method

Let, Total Work Unit = 120 Units

A can finish in 12 days = 120 unit work
i.e. A can finish in 1 days = 10 unit work
i.e. B can finish in 1 days = 10+(60/100)*10 = 16 unit work

Days in which B will complete the work alone = 120/16 = 30/4 = 7.5 days

_________________

Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION

Senior Manager
Joined: 28 Jun 2015
Posts: 298
Concentration: Finance
GPA: 3.5
Re: A can complete a certain job in 12 days. B is 60% [#permalink]

Show Tags

12 Jul 2015, 09:18
Let the number of units of work done by A in one day = 10, so B does 16 units of work per day.

Total units of work done by A = 12*10 = 120 units.

No. of days taken by B to do 120 units of work = 120/16 = 7.5. Ans (D).
_________________

I used to think the brain was the most important organ. Then I thought, look what’s telling me that.

Non-Human User
Joined: 09 Sep 2013
Posts: 13745
Re: A can complete a certain job in 12 days. B is 60% [#permalink]

Show Tags

18 Apr 2017, 09:10
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Senior Manager
Joined: 06 Dec 2016
Posts: 253
Re: A can complete a certain job in 12 days. B is 60% [#permalink]

Show Tags

18 Apr 2017, 09:37
You could even do process elimination

7 x 1 3/5
56/5 or 11 1/5 Not the answer. Let's use a big number

D - 7 1/2 x 1 3/5
15/2 x 8/5
12

The answer is D
Re: A can complete a certain job in 12 days. B is 60%   [#permalink] 18 Apr 2017, 09:37
Display posts from previous: Sort by

A can complete a certain job in 12 days. B is 60%

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.