Last visit was: 21 May 2024, 18:58 It is currently 21 May 2024, 18:58
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.
Close
Request Expert Reply
Confirm Cancel
SORT BY:
Date
Tags:
Show Tags
Hide Tags
Math Expert
Joined: 02 Sep 2009
Posts: 93373
Own Kudos [?]: 625652 [25]
Given Kudos: 81918
Send PM
avatar
Intern
Intern
Joined: 20 Mar 2015
Posts: 16
Own Kudos [?]: 43 [2]
Given Kudos: 4
Location: Italy
GMAT 1: 670 Q48 V34
GPA: 3.7
Send PM
avatar
Manager
Manager
Joined: 02 Mar 2012
Posts: 200
Own Kudos [?]: 294 [0]
Given Kudos: 4
Schools: Schulich '16
Send PM
Senior Manager
Senior Manager
Joined: 28 Feb 2014
Posts: 269
Own Kudos [?]: 320 [0]
Given Kudos: 132
Location: United States
Concentration: Strategy, General Management
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
Bunuel wrote:
A computer can perform c calculations in s seconds. How many minutes will it take the computer to perform k calculations?

A. 60ks/c
B. ks/c
C. ks/60c
D. 60c/ks
E. k/60cs


Kudos for a correct solution.


(s sec/c calculations)(1 min/60 sec)(k calculations) = (ks)/(60c) min

Answer C
avatar
SVP
SVP
Joined: 27 Dec 2012
Status:The Best Or Nothing
Posts: 1559
Own Kudos [?]: 7233 [3]
Given Kudos: 193
Location: India
Concentration: General Management, Technology
WE:Information Technology (Computer Software)
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
3
Kudos
Information in the question is given in seconds, answer asked in minutes.

First, convert the given information in minutes

c calculations are performed in \(\frac{s}{60}\) minutes

Time required for k calculations \(= \frac{s}{60} * \frac{k}{c} = \frac{sk}{60c}\)

Answer = C
Math Expert
Joined: 02 Sep 2009
Posts: 93373
Own Kudos [?]: 625652 [2]
Given Kudos: 81918
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
1
Kudos
1
Bookmarks
Expert Reply
Bunuel wrote:
A computer can perform c calculations in s seconds. How many minutes will it take the computer to perform k calculations?

A. 60ks/c
B. ks/c
C. ks/60c
D. 60c/ks
E. k/60cs


Kudos for a correct solution.


MAGOOSH OFFICIAL SOLUTION:
Attachment:
computercalc_explanation.png
computercalc_explanation.png [ 61.76 KiB | Viewed 26590 times ]
GMAT Club Legend
GMAT Club Legend
Joined: 19 Dec 2014
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Posts: 21843
Own Kudos [?]: 11690 [1]
Given Kudos: 450
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
1
Bookmarks
Expert Reply
Hi All,

As 'thick' as this question might look, it's actually a fairly straight-forward Rate question and can be solved by TESTing VALUES.

We're told that a computer can perform C calculations in S seconds.

Let's TEST....
C = 2
S = 3
2 calculations every 3 seconds =
40 calculations every 1 minute

We're asked how many MINUTES it will take to perform K calculations.

Since we already know that the computer can perform 40 calculations in 1 minute, let's TEST...

K = 80

So we're looking for an answer that = 2 when C = 2, S = 3 and K = 80

Answer A: 60KS/C = 60(80)(3)/2 = 7200 This is NOT a match
Answer B: KS/C = (80)(3)/2 = 120 This is NOT a match
Answer C: KS/60C = (80)(3)/(60)(2) = 2 This IS a match
Answer D: 60C/KS = 60(2)/(80)(3) = 1/2 This is NOT a match
Answer E: K/60CS = 80/(60)(2)(3) = a fraction. This is NOT a match

Final Answer:

GMAT assassins aren't born, they're made,
Rich
avatar
Intern
Intern
Joined: 28 Dec 2015
Posts: 27
Own Kudos [?]: 13 [0]
Given Kudos: 62
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
Work=Rate*time, c=Rate*s
Rate=c/s calc/sec or 60c/s calculations/minute
Now,after calculating the rate,
Work=Rate*Time,this time k=60c/s*time
Or time=ks/60c
User avatar
Manager
Manager
Joined: 18 Jan 2010
Posts: 210
Own Kudos [?]: 1002 [1]
Given Kudos: 9
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
1
Kudos
Bunuel wrote:
A computer can perform c calculations in s seconds. How many minutes will it take the computer to perform k calculations?

A. 60ks/c
B. ks/c
C. ks/60c
D. 60c/ks
E. k/60cs


Kudos for a correct solution.



Unitary method is the key.

c Calculations done in s seconds
1 calculation is done in (s/c) seconds
k calculations r done in (ks/c) seconds

Answer in minutes: (ks/60 c) minutes.

C is the answer.
Tutor
Joined: 16 Oct 2010
Posts: 14891
Own Kudos [?]: 65407 [2]
Given Kudos: 431
Location: Pune, India
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
2
Bookmarks
Expert Reply
Bunuel wrote:
A computer can perform c calculations in s seconds. How many minutes will it take the computer to perform k calculations?

A. 60ks/c
B. ks/c
C. ks/60c
D. 60c/ks
E. k/60cs


Kudos for a correct solution.


In such questions, I usually like to plug in very simple values.
Say 1 ( = c) calculation in 10 (=s) secs. Then 2 (= k) calculations in 20 secs (= 1/3 mins).

Look for the option which gives 1/3 for c = 1, s = 10 and k = 2. From the numbers, it is obvious that we only need to check for (C) and (E) since 60 should be in the denominator to give us 3 in the denominator in the result (there is no other multiple of 3).

Answer (C)
Senior Manager
Senior Manager
Joined: 30 Jun 2019
Posts: 275
Own Kudos [?]: 90 [0]
Given Kudos: 8
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
w = r*t
c = r*s
r = c/s

k = r*t
k = (c/s)*60t
t = ks/60c
User avatar
Intern
Intern
Joined: 30 Oct 2023
Posts: 3
Own Kudos [?]: 1 [0]
Given Kudos: 19
Send PM
Re: A computer can perform c calculations in s seconds. How many minutes [#permalink]
KarishmaB wrote:
Bunuel wrote:
A computer can perform c calculations in s seconds. How many minutes will it take the computer to perform k calculations?

A. 60ks/c
B. ks/c
C. ks/60c
D. 60c/ks
E. k/60cs


Kudos for a correct solution.

In such questions, I usually like to plug in very simple values.
Say 1 ( = c) calculation in 10 (=s) secs. Then 2 (= k) calculations in 20 secs (= 1/3 mins).

Look for the option which gives 1/3 for c = 1, s = 10 and k = 2. From the numbers, it is obvious that we only need to check for (C) and (E) since 60 should be in the denominator to give us 3 in the denominator in the result (there is no other multiple of 3).

Answer (C)
 

Hi KarishmaB, thank you for sharing this interesting approach which I think would be benificial if I can understand it.
Do you mind to elaborate further on the bolden part; especially on how come you can eliminate options other than C & E because other options denominator don't contain 60? 

Thanks before
Tutor
Joined: 16 Oct 2010
Posts: 14891
Own Kudos [?]: 65407 [1]
Given Kudos: 431
Location: Pune, India
Send PM
A computer can perform c calculations in s seconds. How many minutes [#permalink]
1
Kudos
Expert Reply
plex6 wrote:
KarishmaB wrote:
Bunuel wrote:
A computer can perform c calculations in s seconds. How many minutes will it take the computer to perform k calculations?

A. 60ks/c
B. ks/c
C. ks/60c
D. 60c/ks
E. k/60cs


Kudos for a correct solution.

In such questions, I usually like to plug in very simple values.
Say 1 ( = c) calculation in 10 (=s) secs. Then 2 (= k) calculations in 20 secs (= 1/3 mins).

Look for the option which gives 1/3 for c = 1, s = 10 and k = 2. From the numbers, it is obvious that we only need to check for (C) and (E) since 60 should be in the denominator to give us 3 in the denominator in the result (there is no other multiple of 3).

Answer (C)


 

Hi KarishmaB, thank you for sharing this interesting approach which I think would be benificial if I can understand it.
Do you mind to elaborate further on the bolden part; especially on how come you can eliminate options other than C & E because other options denominator don't contain 60? 

Thanks before

I need to plug in values: c = 1, s = 10 and k = 2 in each option. The option that gives us 1/3 is  the answer. Now look at the options.
To plug in values 

\(A. \frac{60ks}{c}\)

I need 1/3. If c = 1, the denominator here is 1. Can I get 1/3? No. k and s are both integers. HOw will I get 3 in denominator?
So not possible. Ignore. 
Same logic for (B) too.

\(D. \frac{60c}{ks}\)

k = 2 and s = 10 so ks in denominator is 20. It doesn't have a 3 as a factor. How will I get 3 in the denominator? c is an integer. Hence ignore. 

(C) and (E) both have 60 in denominator. 60 = 20 * 3 so there is a 3 in the denominator. Now I can get 3. Check for both. ­
GMAT Club Bot
A computer can perform c calculations in s seconds. How many minutes [#permalink]
Moderator:
Math Expert
93373 posts