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.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Carolyn and Brett - nicely explained what is the typical day of a UCLA student. I am posting below recording of the webinar for those who could't attend this session.
Re: If 20 typists can type 48 letters in 20 minutes, then how many letters
[#permalink]
Show Tags
09 Jun 2016, 01:55
1
4
Bunuel wrote:
If 20 typists can type 48 letters in 20 minutes, then how many letters will 30 typists working at the same rate complete in 1 hour?
A. 63 B. 72 C. 144 D. 216 E. 400
Typist---------------letters--------------time --20------------------48------------------20 --20-----------------48*3--------------20*3 --1------------------\(\frac{48*3}{20}\)-----------60 min --30----------------\(\frac{48*3*30}{20-}\)---------60 min
Answer = \(\frac{48*3*30}{20-}=24*3*3 = 216\) D
_________________
Re: If 20 typists can type 48 letters in 20 minutes, then how many letters
[#permalink]
Show Tags
14 Jun 2016, 23:36
Bunuel wrote:
If 20 typists can type 48 letters in 20 minutes, then how many letters will 30 typists working at the same rate complete in 1 hour?
A. 63 B. 72 C. 144 D. 216 E. 400
20 typists can type 48*20 letter minutes 20*20 typist-minutes is equal to 48 letters 1 typist-minute is equal to 48/(20*20) letters 30*60 typist-minutes is equal to 48*30*60/(20*20) letters =216 letters.
Re: If 20 typists can type 48 letters in 20 minutes, then how many letters
[#permalink]
Show Tags
03 Jul 2016, 09:22
The question is asking about the amount of work done in 60 mins or 1 hours. Using this information we can calculate, the amount of work done by 20 typists in 60 minutes 3 (20)*48 = 144 words. Now we can use the unitary method to find the work done by 30 typists in 60 mins i.e. 144/20*30 = 216 word.
Tip: For a fixed time more men imply more work. (considering work done by each man is consistent) therefore, we can also eliminate answer choice A, B, C.
Re: If 20 typists can type 48 letters in 20 minutes, then how many letters
[#permalink]
Show Tags
03 Jul 2016, 09:51
Bunuel wrote:
If 20 typists can type 48 letters in 20 minutes, then how many letters will 30 typists working at the same rate complete in 1 hour?
A. 63 B. 72 C. 144 D. 216 E. 400
20 typists can type 48 letters in 20 minutes
So, working at same pace 20 typists can type 48*3 letters in 1 hour (20*3 minutes) Or, 20 typists can type 144 letters/hr So, Efficiency per worker is 144/20
If 30 workers are employed , they can produce = 144/20*30 =>216 letters Answer will be (D) _________________
Thanks and Regards
Abhishek....
PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS
Re: If 20 typists can type 48 letters in 20 minutes, then how many letters
[#permalink]
Show Tags
10 Jan 2017, 09:06
I used ratios typers:letters:mins 20:48:20 Question asks for one hour first converted 20 mins into one hour by multiplying by 3 Letter:mins 48(3):20(3) 144:60 mins
then to make the 20 equal to 30 typers i multiplied by 3/2 and also multiplyed 3/2(144) typers : letters 20(3/2) = 30 typers : 144(3/2) = 216 letters 30 typers: 216 letters
Re: If 20 typists can type 48 letters in 20 minutes, then how many letters
[#permalink]
Show Tags
01 Aug 2018, 15:27
Bunuel wrote:
If 20 typists can type 48 letters in 20 minutes, then how many letters will 30 typists working at the same rate complete in 1 hour?
A. 63 B. 72 C. 144 D. 216 E. 400
We can set up a proportion to determine the rate n (number of letters per minute) of 30 typists.
20 typists / rate of those 20 typists = 30 typists / (unknown) rate of those 30 typists
20/(48/20) = 30/n
20/(12/5) = 30/n
100/12 = 30/n
100n = 12 x 30
10n = 12 x 3
10n = 36
n = 3.6
We see that the rate of 30 typists is 3.6 letters per minute. So in 60 minutes, 30 typists can complete 3.6 x 60 = 216 letters.
Alternate Solution:
We know that 20 typists can type 48 letters in 20 minutes. Thus, we see that in 60 minutes, or 1 hour, those 20 typists can type 3 times as many letters, or 3 x 48 = 144 letters. We can now set up a proportion for n = the number of letters that can be typed in 1 hour by 30 typists:
20/144 = 30/n
20n = 144 x 30
2n = 144 x 3
n = 216
Answer: D
_________________
Scott Woodbury-Stewart Founder and CEO
GMAT Quant Self-Study Course 500+ lessons 3000+ practice problems 800+ HD solutions
close
77% (01:25) correct 
