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

Redeem

fashion continues without break

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 am
Location: India
Thanked: 267 times
Followed by:80 members
GMAT Score:760

fashion continues without break

by sanju09 » Wed Jun 11, 2014 1:33 am
A monkey is trying to reach on top of a 30 meter high greasy electric pole in such a way, that it ascends by 2 meters in the first minute, it descends by 1 meter in the second minute, ascends by 2 meters in the third minute, descends by 1 meter in the fourth minute, and so on. If this fashion continues without break, after how many minutes of its start from the base of the electric pole, will the monkey be able to reach on the top of it?
(A) 60
(B) 57
(C) 56
(D) 48
(E) 30



Made Up!
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 1556
Joined: Tue Aug 14, 2012 11:18 pm
Thanked: 448 times
Followed by:34 members
GMAT Score:650

by theCodeToGMAT » Wed Jun 11, 2014 4:53 am
+2 -1 +2 -1 .......... ==> So, in 2 minutes = 1 meter

1 meter = 2 minutes
28 meter = 56 minutes..
Now, it ascends 2 meter... So, 30 meter = 57 seconds

[spoiler]{B}?[/spoiler]
R A H U L
Top
Master | Next Rank: 500 Posts
Posts: 447
Joined: Fri Nov 08, 2013 7:25 am
Thanked: 25 times
Followed by:1 members

by Mathsbuddy » Fri Jun 13, 2014 8:34 am
Metres Seconds
2 1
3 3
4 5
5 7
N 2N - 3

N = 30 60 - 3 = 57
Top
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 am
Location: India
Thanked: 267 times
Followed by:80 members
GMAT Score:760

by sanju09 » Sun Jun 22, 2014 12:19 am
Good approaches friends :)

Another one...

In order to reach on the top of the pole, the last leap of the monkey must be an ascend (2-meter rise takes 1 minute), hence, let's focus on the time taken in reaching to the remaining 28 meters up the base.

Since it starts from an ascend of 2 meters in the first minute, and a descend of 1 meter in the next minute, hence, ideally, its rate is always 1 meter rise per 2 minutes. Hence, a 28 meters rise would take the monkey 56 minutes, add 1 minute of the last leap and answer [spoiler](B) 57.[/spoiler]
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Post new topic Post Reply
• Page 1 of 1