Last visit was: 06 Sep 2026, 10:40 It is currently 06 Sep 2026, 10:40
Home
Messages
Tests
Schools
Events
Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
555-605 (Medium)|   Word Problems|         
User avatar
mehdiov
User avatar
Joined: 22 Jun 2010
Last visit: 13 Oct 2011
Posts: 18
Own Kudos:
1,154
 [33]
Given Kudos: 1
Posts: 18
Kudos: 1,154
 [33]
Yesterday Diana spent a total of 240 minutes attending a 07 Sep 2010, 15:37
1
Kudos
Add Kudos
31
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

35% (medium)

Question Stats:

76% (02:04) correct 24% (02:06) wrong based on 953 sessions

History

Date
Time
Result
Not Attempted Yet
Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-mails, and talking on the phone. If she did no two of these three activities at the same time, how much time did she spend talking on the phone?

(1) Yesterday the amount of time that Diana spent attending the training class was 90 percent of the amount of time that she spent responding to E-mails.
(2) Yesterday the amount of time that Diana spent attending the training class was 60 percent of the total amount of time that she spent responding to E-mails and talking on the phone.
ShowHide Answer
Official Answer
C
Drill more questions that test the same idea in GMAT Club Timed Quiz → Free.
Most Helpful Reply
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 06 Sep 2026
Posts: 113,158
Own Kudos:
839,547
 [8]
Given Kudos: 111,337
Products:
GMAT Club Tests
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 113,158
Kudos: 839,547
 [8]
Yesterday Diana spent a total of 240 minutes attending a 07 Sep 2010, 15:48
6
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
mehdiov
Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-
mails, and talking on the phone. If she did no two of these three activities at the same
time, how much time did she spend talking on the phone?
(1) Yesterday the amount of time that Diana spent attending the training class was
90 percent of the amount of time that she spent responding to E-mails.
(2) Yesterday the amount of time that Diana spent attending the training class was
60 percent of the total amount of time that she spent responding to E-mails and
talking on the phone.
Show more

Given: \(C+E+P=240\), where C is th time she spent on training class, E is the time she spent on E-mail and P is the time she spent on phone. Question: \(P=?\)

(1) \(C=0.9E\) --> \(C+E+P=0.9E+E+P=1.9E+P=240\). Not sufficient to calculate \(P\) (one equation, two variables).

(2) \(C=0.6(E+P)\) --> \(C+E+P=0.6(E+P)+E+P=1.6E+1.6P=240\). Not sufficient to calculate \(P\) (one equation, two variables).

(1)+(2) \(1.9E+P=240\) and \(1.6E+1.6P=240\) --> we have two distinct linear equations with two variables hence we can calculate each of them. Sufficient.

Answer: C.
General Discussion
avatar
bulletpoint
avatar
Joined: 02 Jul 2013
Last visit: 13 May 2014
Posts: 16
Own Kudos:
1,376
 [1]
Given Kudos: 16
Schools: LBS MIF '15
Schools: LBS MIF '15
Posts: 16
Kudos: 1,376
 [1]
Yesterday Diana spent a total of 240 minutes attending a 22 Oct 2013, 07:02
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
mehdiov
Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-
mails, and talking on the phone. If she did no two of these three activities at the same
time, how much time did she spend talking on the phone?
(1) Yesterday the amount of time that Diana spent attending the training class was
90 percent of the amount of time that she spent responding to E-mails.
(2) Yesterday the amount of time that Diana spent attending the training class was
60 percent of the total amount of time that she spent responding to E-mails and
talking on the phone.

Given: \(C+E+P=240\), where C is th time she spent on training class, E is the time she spent on E-mail and P is the time she spent on phone. Question: \(P=?\)

(1) \(C=0.9E\) --> \(C+E+P=0.9E+E+P=1.9E+P=240\). Not sufficient to calculate \(P\) (one equation, two variables).

(2) \(C=0.6(E+P)\) --> \(C+E+P=0.6(E+P)+E+P=1.6E+1.6P=240\). Not sufficient to calculate \(P\) (one equation, two variables).

(1)+(2) \(1.9E+P=240\) and \(1.6E+1.6P=240\) --> we have two distinct linear equations with two variables hence we can calculate each of them. Sufficient.

Answer: C.
Show more

Bunuel, for statement 2 we can rearrange to get E+P=240/1.6. If we have E+P, cant we plug this into C+E+P=240, which gives us C+(240/1.6)=240, which gives us C=240-(240/1.6)? Hence 2 would be sufficient as you rearrange to get P?
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 06 Sep 2026
Posts: 113,158
Own Kudos:
839,547
Given Kudos: 111,337
Products:
GMAT Club Tests
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 113,158
Kudos: 839,547
Yesterday Diana spent a total of 240 minutes attending a 22 Oct 2013, 07:56
Kudos
Add Kudos
Bookmarks
Bookmark this Post
bulletpoint
Bunuel
mehdiov
Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-
mails, and talking on the phone. If she did no two of these three activities at the same
time, how much time did she spend talking on the phone?
(1) Yesterday the amount of time that Diana spent attending the training class was
90 percent of the amount of time that she spent responding to E-mails.
(2) Yesterday the amount of time that Diana spent attending the training class was
60 percent of the total amount of time that she spent responding to E-mails and
talking on the phone.

Given: \(C+E+P=240\), where C is th time she spent on training class, E is the time she spent on E-mail and P is the time she spent on phone. Question: \(P=?\)

(1) \(C=0.9E\) --> \(C+E+P=0.9E+E+P=1.9E+P=240\). Not sufficient to calculate \(P\) (one equation, two variables).

(2) \(C=0.6(E+P)\) --> \(C+E+P=0.6(E+P)+E+P=1.6E+1.6P=240\). Not sufficient to calculate \(P\) (one equation, two variables).

(1)+(2) \(1.9E+P=240\) and \(1.6E+1.6P=240\) --> we have two distinct linear equations with two variables hence we can calculate each of them. Sufficient.

Answer: C.

Bunuel, for statement 2 we can rearrange to get E+P=240/1.6. If we have E+P, cant we plug this into C+E+P=240, which gives us C+(240/1.6)=240, which gives us C=240-(240/1.6)? Hence 2 would be sufficient as you rearrange to get P?
Show more

Please show your work and get the value of P.
User avatar
shashankism
User avatar
Joined: 13 Mar 2017
Last visit: 29 Jun 2026
Posts: 612
Own Kudos:
724
Given Kudos: 88
Affiliations: IIT Dhanbad
Location: India
Concentration: General Management, Entrepreneurship
GPA: 3.8
WE:Engineering (Energy)
Posts: 612
Kudos: 724
Yesterday Diana spent a total of 240 minutes attending a 03 Oct 2017, 23:11
Kudos
Add Kudos
Bookmarks
Bookmark this Post
mehdiov
Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-mails, and talking on the phone. If she did no two of these three activities at the same time, how much time did she spend talking on the phone?

(1) Yesterday the amount of time that Diana spent attending the training class was 90 percent of the amount of time that she spent responding to E-mails.
(2) Yesterday the amount of time that Diana spent attending the training class was 60 percent of the total amount of time that she spent responding to E-mails and talking on the phone.
Show more

Let T denotes the time spent attending a training class.
Let E denotes the time spent responding to E-mails.
Let P denotes the time spent talking on the phone.

T +E + P = 240

DS: Find P ?

Statement 1 : T = 0.9 E .......(i)
Also, T +E + P = 240
0.9 E + E + P = 240
1.9 E + P = 240 .........(ii)

NOT SUFFICIENT

Statement 2:
T = 0.6 (E+P) ........(iii)
Also, T +E + P = 240
T + T /0.6 = 240 ..........(iv)
OR
(0.6+1) (E+P) = 240.......(v)
we can find T but not P.

NOT SUFFICIENT

Combined : From i & iii
0.9 E = 0.6 (E+P)
0.3 E = 0.6 P
E = 2P

From (v) 1.6 (2P+P) = 240
P = 240 / 4.8 = 50

Answer D
User avatar
gota900
User avatar
Joined: 15 Aug 2018
Last visit: 27 Aug 2021
Posts: 35
Own Kudos:
13
Given Kudos: 49
GMAT 1: 740 Q47 V45
GPA: 3.5
GMAT 1: 740 Q47 V45
Posts: 35
Kudos: 13
Yesterday Diana spent a total of 240 minutes attending a 30 Dec 2018, 05:48
Kudos
Add Kudos
Bookmarks
Bookmark this Post
For statement 1, isn't P the same as 240-1.9 E, which then again would be 240 ? I.e. 1.9E + (240 - 1.9E) = 240 ?

I am confused

Best, gota900
User avatar
Rebaz
User avatar
Joined: 14 Feb 2014
Last visit: 02 Aug 2026
Posts: 144
Own Kudos:
46
Given Kudos: 4,775
Posts: 144
Kudos: 46
Yesterday Diana spent a total of 240 minutes attending a 26 Aug 2021, 05:37
Kudos
Add Kudos
Bookmarks
Bookmark this Post
shashankism
mehdiov
Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-mails, and talking on the phone. If she did no two of these three activities at the same time, how much time did she spend talking on the phone?

(1) Yesterday the amount of time that Diana spent attending the training class was 90 percent of the amount of time that she spent responding to E-mails.
(2) Yesterday the amount of time that Diana spent attending the training class was 60 percent of the total amount of time that she spent responding to E-mails and talking on the phone.

Let T denotes the time spent attending a training class.
Let E denotes the time spent responding to E-mails.
Let P denotes the time spent talking on the phone.

T +E + P = 240

DS: Find P ?

Statement 1 : T = 0.9 E .......(i)
Also, T +E + P = 240
0.9 E + E + P = 240
1.9 E + P = 240 .........(ii)

NOT SUFFICIENT

Statement 2:
T = 0.6 (E+P) ........(iii)
Also, T +E + P = 240
T + T /0.6 = 240 ..........(iv)
OR
(0.6+1) (E+P) = 240.......(v)
we can find T but not P.

NOT SUFFICIENT

Combined : From i & iii
0.9 E = 0.6 (E+P)
0.3 E = 0.6 P
E = 2P

From (v) 1.6 (2P+P) = 240
P = 240 / 4.8 = 50

Answer D
Show more

Your final answer should be C not D
User avatar
minionbaba
User avatar
Joined: 01 Dec 2024
Last visit: 30 Jul 2026
Posts: 58
Own Kudos:
21
 [1]
Given Kudos: 72
Posts: 58
Kudos: 21
 [1]
Yesterday Diana spent a total of 240 minutes attending a 10 Jun 2026, 05:52
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi Bunuel, this question is also available in OG 2025-26. You can add that tag too. Thank you!
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 06 Sep 2026
Posts: 113,158
Own Kudos:
839,547
Given Kudos: 111,337
Products:
GMAT Club Tests
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 113,158
Kudos: 839,547
Yesterday Diana spent a total of 240 minutes attending a 10 Jun 2026, 05:53
Kudos
Add Kudos
Bookmarks
Bookmark this Post
minionbaba
Hi Bunuel, this question is also available in OG 2025-26. You can add that tag too. Thank you!
Show more

Added the tag. Thank you!
Moderators:
Bunuel
Math Expert
113158 posts
FrozenDragon
DI Forum Moderator
409 posts