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

Redeem

Java guys

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 2326
Joined: Mon Jul 28, 2008 3:54 am
Thanked: 173 times
Followed by:2 members
GMAT Score:710

Java guys

by gmatmachoman » Mon Apr 05, 2010 7:37 am
15 Java programmers, working in a constant pace, finish a web page in 3 days. If after one day, 9 programmers quit, how many more days are needed to finish the remainder of the job?

(a) 5.
(b) 2.
(c) 8.
(d) 4.
(e) 6.
Top
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 1560
Joined: Tue Nov 17, 2009 2:38 am
Thanked: 137 times
Followed by:5 members

by thephoenix » Mon Apr 05, 2010 8:20 am
eqn is
M1*d1/w1=M2*d2/w2
w1=1
w2=1-1/3( as in one day 1/3 of web page is finished)=2/3
m1=15
m2=6
d1=3
solving for d2=5
hence a
Top
Legendary Member
Posts: 2326
Joined: Mon Jul 28, 2008 3:54 am
Thanked: 173 times
Followed by:2 members
GMAT Score:710

by gmatmachoman » Mon Apr 05, 2010 8:24 am
thephoenix wrote:eqn is
M1*d1/w1=M2*d2/w2
w1=1
w2=1-1/3( as in one day 1/3 of web page is finished)=2/3
m1=15
m2=6
d1=3
solving for d2=5
hence a
Thx bro..
I have devised a small tic for this kind of problems:

Change in Men : Original Men :: Change in days : required days

Now try a example:
(15-9):15::(3-1):required days

6:15::2:X

X=5(Easy isnt it??)

Feedbacks are requested
Top
Master | Next Rank: 500 Posts
Posts: 148
Joined: Tue Jun 09, 2009 11:06 pm
Thanked: 7 times

by pops » Mon Apr 05, 2010 9:13 pm
gmatmachoman wrote:15 Java programmers, working in a constant pace, finish a web page in 3 days. If after one day, 9 programmers quit, how many more days are needed to finish the remainder of the job?

(a) 5.
(b) 2.
(c) 8.
(d) 4.
(e) 6.
Another way of thinking it is consider number of "Java programmers days" (JPD) required to complete whole work = 15*3 = 45
1 day 15 JP already worked hence 15 JPD is done left 45-15 = 30 JPD
JP left = 6
hence, D required = 30 JPD/ 6 JP = 5 Days :-)
Top
User avatar
Legendary Member
Posts: 526
Joined: Sat Feb 21, 2009 11:47 pm
Location: India
Thanked: 68 times
GMAT Score:680

by harshavardhanc » Tue Apr 06, 2010 12:44 am
gmatmachoman wrote:15 Java programmers, working in a constant pace, finish a web page in 3 days. If after one day, 9 programmers quit, how many more days are needed to finish the remainder of the job?

(a) 5.
(b) 2.
(c) 8.
(d) 4.
(e) 6.
Product constancy ! :) Man-days (man * days ) is constant.

the programmers have decreased by 60% or have become .4 of the original.

So, the days have to become 2.5 times of the original. OR 2.5 * 2 = 5
Regards,
Harsha
Top
Post new topic Post Reply
• Page 1 of 1