Last visit was: 19 May 2026, 01:27 It is currently 19 May 2026, 01:27
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
   1   2 
555-605 (Medium)|   Word Problems|                                          
User avatar
avigutman
User avatar
Joined: 17 Jul 2019
Last visit: 30 Sep 2025
Posts: 1,285
Own Kudos:
916
Given Kudos: 66
Location: Canada
Schools: NYU Stern (WA)
GMAT 1: 780 Q51 V45
GMAT 2: 780 Q50 V47
GMAT 3: 770 Q50 V45
Expert
Expert reply
Schools: NYU Stern (WA)
GMAT 3: 770 Q50 V45
Posts: 1,285
Kudos: 916
In a certain business, production index p is directly proportional to 02 Aug 2021, 10:52
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Video solution from Quant Reasoning:
Subscribe for more: https://www.youtube.com/QuantReasoning? ... irmation=1
User avatar
Elite097
User avatar
Joined: 20 Apr 2022
Last visit: 08 May 2026
Posts: 735
Own Kudos:
570
Given Kudos: 337
Location: India
Schools: Sloan '25 Columbia '27 Haas '27
GPA: 3.64
Schools: Sloan '25 Columbia '27 Haas '27
Posts: 735
Kudos: 570
In a certain business, production index p is directly proportional to 22 Feb 2023, 05:31
Kudos
Add Kudos
Bookmarks
Bookmark this Post
avigutman How is k derived when two proportional equations are merged
User avatar
avigutman
User avatar
Joined: 17 Jul 2019
Last visit: 30 Sep 2025
Posts: 1,285
Own Kudos:
916
Given Kudos: 66
Location: Canada
Schools: NYU Stern (WA)
GMAT 1: 780 Q51 V45
GMAT 2: 780 Q50 V47
GMAT 3: 770 Q50 V45
Expert
Expert reply
Schools: NYU Stern (WA)
GMAT 3: 770 Q50 V45
Posts: 1,285
Kudos: 916
In a certain business, production index p is directly proportional to 22 Feb 2023, 08:45
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Elite097
avigutman How is k derived when two proportional equations are merged
Show more
We also have the value of i from the free info in the question stem. Elite097

Posted from my mobile device
User avatar
shwetakoshija
User avatar
Joined: 08 Jul 2017
Last visit: 11 May 2026
Posts: 85
Own Kudos:
74
Given Kudos: 13
Expert
Expert reply
Posts: 85
Kudos: 74
In a certain business, production index p is directly proportional to 26 Mar 2026, 04:48
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Question Stem:
  • p ∝ e ⇒ p = ae and e ∝ i ⇒ e = bi
  • Combining them, we get p = (ab)i

To find: The value of p when i = 70

Approach: To find p at a given value of i, we need the product ab. To be sufficient, either a statement should give us both a and b or directly, the product ab.

Statement (1): e = 0.7 when i = 60
  • We know that e = bi.
  • So, statement 1 helps us find the value of b.

Since we still don’t know a, we cannot find the value of ab.
Statement 1 is not sufficient alone. Eliminate A and D.

Statement (2): p = 2.0 when i = 50
  • We know that p = (ab)i.
  • So, 2 = (ab)(50)
  • We can find ab = 1/25.
Statement (2) is sufficient alone.

Correct Answer: B

Shweta Koshija
GMAT, GRE, SAT Coach for 10+ years
   1   2 
Moderators:
Bunuel
Math Expert
110695 posts
kingbucky
498 posts
Gmat860sanskar
266 posts