Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
May 2008:00 AM PDT
-08:30 AM PDT
What’s in it for you- Live Profile Evaluation Chat Session with Jenifer Turtschanow, CEO, ARINGO. Come with your details prepared and ARINGO will share insights! Pre-MBA Role/Industry, YOE, Exam Score, C/GPA, ECs Post-MBA Role/ Industry & School List.
Jun 1006:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
19 May 2026, 14:02
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
57% (02:13) correct
43%
(02:31)
wrong
based on 7
sessions
History
Date
Time
Result
Not Attempted Yet
During the first quarter of last year, the frog populations in ponds A and B fell by 75% and 60%, respectively; during the second quarter, they increased by 200% and 650%. If the two ponds contained the same number of frogs at the end of the second quarter, then at the beginning of the year the population in pond A was what percent greater than that in pond B?
(A) 300%
(B) 325%
(C) 350%
(D) 375%
(E) 400%
(A) 300%
(B) 325%
(C) 350%
(D) 375%
(E) 400%
19 May 2026, 14:09
Kudos
Bookmarks
Let's call the starting populations A and B.
1. After Q1: Pond A fell by 75%, so it's left with 0.25A. Pond B fell by 60%, leaving 0.40B.
2. During Q2: "Increased by 200%" means the value tripled (grew by 2x of itself). So Pond A becomes 0.25A x 3 = 0.75A. "Increased by 650%" means it grew to 7.5x its Q1 value. Pond B becomes 0.40B x 7.5 = 3B.
3. Set them equal at the end of Q2: 0.75A = 3B, so A = 4B.
4. "Pond A was what percent greater than Pond B?" means (A - B)/B x 100 = (4B - B)/B x 100 = 300%.
Answer: (A) 300%
The trap here is "increased by 650%" — a lot of people read that as "multiplied by 6.5" instead of "grew by 6.5 times the current amount," which gives you 7.5 as the multiplier. I got burned on a similar phrasing my first time through percent change problems. "Increased BY x%" always means multiply by (1 + x/100).
Quick sanity check: if B started at 100, then A started at 400. End of Q1: A = 100, B = 40. End of Q2: A = 300, B = 300. Same. Confirms the answer.
________________
Founder at edskore.com | Try free adaptive diagnostic tests
1. After Q1: Pond A fell by 75%, so it's left with 0.25A. Pond B fell by 60%, leaving 0.40B.
2. During Q2: "Increased by 200%" means the value tripled (grew by 2x of itself). So Pond A becomes 0.25A x 3 = 0.75A. "Increased by 650%" means it grew to 7.5x its Q1 value. Pond B becomes 0.40B x 7.5 = 3B.
3. Set them equal at the end of Q2: 0.75A = 3B, so A = 4B.
4. "Pond A was what percent greater than Pond B?" means (A - B)/B x 100 = (4B - B)/B x 100 = 300%.
Answer: (A) 300%
The trap here is "increased by 650%" — a lot of people read that as "multiplied by 6.5" instead of "grew by 6.5 times the current amount," which gives you 7.5 as the multiplier. I got burned on a similar phrasing my first time through percent change problems. "Increased BY x%" always means multiply by (1 + x/100).
Quick sanity check: if B started at 100, then A started at 400. End of Q1: A = 100, B = 40. End of Q2: A = 300, B = 300. Same. Confirms the answer.
________________
Founder at edskore.com | Try free adaptive diagnostic tests
