GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 16 Feb 2019, 21:53

### 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

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

## Events & Promotions

###### Events & Promotions in February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
• ### Free GMAT Algebra Webinar

February 17, 2019

February 17, 2019

07:00 AM PST

09:00 AM PST

Attend this Free Algebra Webinar and learn how to master Inequalities and Absolute Value problems on GMAT.
• ### Free GMAT Strategy Webinar

February 16, 2019

February 16, 2019

07:00 AM PST

09:00 AM PST

Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.

# If Karishma spends 53 seconds folding H napkins, how many seconds

Author Message
TAGS:

### Hide Tags

Director
Joined: 08 Jun 2013
Posts: 552
Location: France
GMAT 1: 200 Q1 V1
GPA: 3.82
WE: Consulting (Other)
If Karishma spends 53 seconds folding H napkins, how many seconds  [#permalink]

### Show Tags

29 Sep 2018, 02:28
1
00:00

Difficulty:

15% (low)

Question Stats:

76% (00:39) correct 24% (01:03) wrong based on 31 sessions

### HideShow timer Statistics

If Karishma spends 53 seconds folding H napkins, how many seconds will it take her to fold B napkins at the same rate?

A) 53B/H

B) HB/53

C) 53/HB

D) 53H/B

E) 53HB

_________________

Everything will fall into place…

There is perfect timing for
everything and everyone.
Never doubt, But Work on
improving yourself,
Keep the faith and
It will all make sense.

e-GMAT Representative
Joined: 04 Jan 2015
Posts: 2568
If Karishma spends 53 seconds folding H napkins, how many seconds  [#permalink]

### Show Tags

29 Sep 2018, 03:36

Solution

Given:
• Karishma spends 53 seconds folding H napkins

To find:
• The time Karishma will take (in secs) to fold B napkins, working at the same rate

Approach and Working:

To fold H napkins, Karishma takes 53 seconds
• Hence, to fold 1 napkin, Karishma takes $$\frac{53}{H}$$ seconds
Therefore, to fold B napkins, Karishma takes $$\frac{53}{H} * B$$ seconds = $$\frac{53B}{H}$$ seconds

Hence, the correct answer is option A.

_________________

| '4 out of Top 5' Instructors on gmatclub | 70 point improvement guarantee | www.e-gmat.com

Senior SC Moderator
Joined: 22 May 2016
Posts: 2471
If Karishma spends 53 seconds folding H napkins, how many seconds  [#permalink]

### Show Tags

29 Sep 2018, 20:39
Harshgmat wrote:
If Karishma spends 53 seconds folding H napkins, how many seconds will it take her to fold B napkins at the same rate?

A) 53B/H

B) HB/53

C) 53/HB

D) 53H/B

E) 53HB

The trap in this question: $$B$$ napkins = Work
Work needs to be divided by rate in order to get time

How many seconds to fold $$B$$ napkins?

Rate: $$\frac{H.napkins}{53secs}=\frac{H}{53}$$

Work: $$B$$ napkins

$$r*t=W$$
$$\frac{H}{53}*t=B$$
Time, $$t=\frac{B}{(\frac{H}{53})}=(B*\frac{53}{H})=\frac{53B}{H}$$

_________________

To live is the rarest thing in the world.
Most people just exist.

Oscar Wilde

Intern
Joined: 14 Aug 2017
Posts: 13
If Karishma spends 53 seconds folding H napkins, how many seconds  [#permalink]

### Show Tags

30 Sep 2018, 01:18
Hi Everyone,

I solved the question in a different way. I feel that it is a quicker approach, so thought of sharing the approach.

There are 2 variables (H,B) in the question. Lets assume some values to both H and B , so that we can calculate it more easily.

Let H = 10 and B =20. (We can assume any number , it will lead to the same answer. Here I am taking 10 and 20 for making the calculations easy)

Now we will workout the problem with the information given in the question stem.
The question stem says Karishma takes 53 second to fold H napkins . Substituting H we get :-

10 napkins =53 secs
1 napkin = 53/10
B napkins = (53/10)*B
we have assumed B = 20, substituting the value of B in the above equation, we will get :-
20 napkins = (53/10)*20=106

Now we can substitute the values of B and H in the answer choices and the answer choice which provides the same result(106) as above will be the correct answer.

(A) - > 53B/H= (53*20)/10=106 .

which is same as the answer we got above.
Therefore Option A is correct answer.
If Karishma spends 53 seconds folding H napkins, how many seconds   [#permalink] 30 Sep 2018, 01:18
Display posts from previous: Sort by