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.
Apr 2512:30 AM EDT
-01:30 AM EDT
At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
Apr 2601:30 AM EDT
-02:30 AM EDT
Learn how Keshav, a Chartered Accountant, scored an impressive 705 on GMAT in just 30 days with GMATWhiz's expert guidance. In this video, he shares preparation tips and strategies that worked for him, including the mock, time management, and more.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
May 0111:00 AM PDT
-12:00 PM PDT
Free- full-length test + 15 concept videos + 150+ short videos + study plan!
Thelegend2631
Posts: 371
Updated on: 13 Jun 2021, 23:37
Originally posted by Thelegend2631 on 13 Jun 2021, 20:35.
Last edited by chetan2u on 13 Jun 2021, 23:37, edited 1 time in total.
Last edited by chetan2u on 13 Jun 2021, 23:37, edited 1 time in total.
Edited
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
65% (03:03) correct
35%
(03:10)
wrong
based on 132
sessions
History
Date
Time
Result
Not Attempted Yet
A group of people decided to cut 128 trees in a certain number of days. For the first 4 days, they were able to achieve their planned per day target. However, for the remaining days, the group was able to cut 4 more trees daily than planned. In this way, the group could cut 164 trees one day before the planned finish date. What was the number of trees the group was planning to cut per day?
(A) 6
(B) 7
(C) 8
(D) 12
(E) 16
Posted from my mobile device
(A) 6
(B) 7
(C) 8
(D) 12
(E) 16
Posted from my mobile device
14 Jun 2021, 07:38
Kudos
Bookmarks
If, initially, they planned to cut n trees per day, and after d days they would cut 128 trees, then nd = 128, and n is a factor of 128. Only two answer choices, C and E, are factors of 128, so one of those must be correct. Intuitively, answer E, 16, should seem much too large. The tree-cutters finished not only with a huge surplus of cut trees, but they also finished ahead of schedule. Increasing the trees cut per day from 16 to 20, a relatively small amount, midway through cutting isn't going to produce such a large effect. We can confirm that: if they did cut 16 trees per day, they intended to finish in 8 days. If they cut 16 per day for 4 days, they cut 64 trees. If they then raised their rate to 20 per day, and worked for only 3 more days rather than 4, they only cut 60 additional trees, and they don't even complete the task. So C must be the answer.
Posted from my mobile device
Posted from my mobile device
14 Jun 2021, 22:22
Kudos
Bookmarks
hD13
Logical thinking ( Options )
As we have 128 trees cut over a certain period of days, we can safely assume that number of days and number of trees per day should be factors of 128.
\(128 = 2^7 \), so the answer should have only 2s in it.
Eliminate A, B and D.
C) 8
So 8 trees per day for 16 days.
Number of trees = 4*8+(16-1-4)*(8+4)=32+11*12=164...Matches the quantity given in question
Algebraic
Let the number of days be n, so trees per day = \(\frac{128}{n}\)
First 4 days: \(4*\frac{128}{n}\)
Next n-1-4 days: \((n-5)*(\frac{128}{n}+4)\)
Total = \((n-5)*(\frac{128}{n}+4)+4*\frac{128}{n}=164\)
\((n-5)(128+4n)+4*128=164n..........128n+4n^2-5*4n-5*128+4*128=164n.........32n+n^2-5n-160+128=41n\)
\(n^2-14n-32=0.......n^2-16n+2n-32=0.....(n-16)(n+2)=0\)
So, n=16 or -2..
Number of days = 16, so trees per day = 128/16=8
C
