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Working together, printer A and printer B would finish the

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Working together, printer A and printer B would finish the [#permalink] New post 01 Sep 2010, 10:12
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

65% (03:24) correct 35% (02:57) wrong based on 180 sessions
Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?

A. 600
B. 800
C. 1000
D. 1200
E. 1500

[Reveal] Spoiler:
I know this question is relatively symol if make an equation in one vaibale ...
I tried to do it by applying the fundamental of A = Jobs per min * time ( the way we typically solve the work problems ) and i was stuck

I did jobs per minute A , 1/60
combined rate = 1/24

so rate of b = 1/24 - 1/60 = 1/40

but could not arrive at the solution ... i tried to form the equation by assuming x as the total numbe of pages So x/60+ x+5/40 = cld nt take ot forward from here
kindly see where am I losing the track !
[Reveal] Spoiler: OA

Last edited by Bunuel on 06 Sep 2012, 09:01, edited 2 times in total.
Edited the question.
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Re: solution required [#permalink] New post 01 Sep 2010, 11:56
5
This post received
KUDOS
Expert's post
gauravnagpal wrote:
.Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?

a. 600
b. 800
c. 1000
d. 1200
e. 1500

answer: A
I know this question is relatively symol if make an equation in one vaibale ...
I tried to do it by applying the fundamental of A = Jobs per min * time ( the way we typically solve the work problems ) and i was stuck

I did jobs per minute A , 1/60
combined rate = 1/24

so rate of b = 1/24 - 1/60 = 1/40

but could not arrive at the solution ... i tried to form the equation by assuming x as the total numbe of pages So x/60+ x+5/40 = cld nt take ot forward from here
kindly see where am I losing the track !


Let the rate of printer A be a pages per minute, the rate of printer B be b pages per minute and whole task be x pages.

time*rate=job \ done:

Working together, printer A and printer B would finish the task in 24 minutes" --> 24(a+b)=x;
Printer A alone would finish the task in 60 minutes --> 60a=x;
Printer B prints 5 pages a minute more than printer A --> b=a+5.

Solving for x --> x=600.

Answer: A.

Some work problems with solutions:
time-n-work-problem-82718.html?hilit=reciprocal%20rate
facing-problem-with-this-question-91187.html?highlight=rate+reciprocal
what-am-i-doing-wrong-to-bunuel-91124.html?highlight=rate+reciprocal
gmat-prep-ps-93365.html?hilit=reciprocal%20rate
questions-from-gmat-prep-practice-exam-please-help-93632.html?hilit=reciprocal%20rate
a-good-one-98479.html?hilit=rate

Hope it helps.
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Re: solution required [#permalink] New post 03 Sep 2010, 10:26
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B in a minute=x/40
A in a minute=x/60
then,
x/40-x/60=5

Solving x=600
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Re: solution required [#permalink] New post 06 Sep 2012, 07:09
Bunuel wrote:
gauravnagpal wrote:
.Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?

a. 600
b. 800
c. 1000
d. 1200
e. 1500

answer: A
I know this question is relatively symol if make an equation in one vaibale ...
I tried to do it by applying the fundamental of A = Jobs per min * time ( the way we typically solve the work problems ) and i was stuck

I did jobs per minute A , 1/60
combined rate = 1/24

so rate of b = 1/24 - 1/60 = 1/40

but could not arrive at the solution ... i tried to form the equation by assuming x as the total numbe of pages So x/60+ x+5/40 = cld nt take ot forward from here
kindly see where am I losing the track !


Let the rate of printer A be a pages per minute, the rate of printer B be b pages per minute and whole task be x pages.

time*rate=job \ done:

Working together, printer A and printer B would finish the task in 24 minutes" --> 24(a+b)=x;
Printer A alone would finish the task in 60 minutes --> 60a=x;
Printer B prints 5 pages a minute more than printer A --> b=a+5.

Solving for x --> x=600.

Answer: A.

Some work problems with solutions:
time-n-work-problem-82718.html?hilit=reciprocal%20rate
facing-problem-with-this-question-91187.html?highlight=rate+reciprocal
what-am-i-doing-wrong-to-bunuel-91124.html?highlight=rate+reciprocal
gmat-prep-ps-93365.html?hilit=reciprocal%20rate
questions-from-gmat-prep-practice-exam-please-help-93632.html?hilit=reciprocal%20rate
a-good-one-98479.html?hilit=rate

Hope it helps.


Hi Bunnel,

I have always one confusion in rate and work problems can you please clarify this?,

When do we add rates i.e what you did above...... 24(a+b)=x;

and when do we divide by rates i.e something . rate =(Job done/ time)

Regards

Srinath
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Re: solution required [#permalink] New post 06 Sep 2012, 09:39
Expert's post
kotela wrote:
Bunuel wrote:
gauravnagpal wrote:
.Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?

a. 600
b. 800
c. 1000
d. 1200
e. 1500

answer: A
I know this question is relatively symol if make an equation in one vaibale ...
I tried to do it by applying the fundamental of A = Jobs per min * time ( the way we typically solve the work problems ) and i was stuck

I did jobs per minute A , 1/60
combined rate = 1/24

so rate of b = 1/24 - 1/60 = 1/40

but could not arrive at the solution ... i tried to form the equation by assuming x as the total numbe of pages So x/60+ x+5/40 = cld nt take ot forward from here
kindly see where am I losing the track !


Let the rate of printer A be a pages per minute, the rate of printer B be b pages per minute and whole task be x pages.

time*rate=job \ done:

Working together, printer A and printer B would finish the task in 24 minutes" --> 24(a+b)=x;
Printer A alone would finish the task in 60 minutes --> 60a=x;
Printer B prints 5 pages a minute more than printer A --> b=a+5.

Solving for x --> x=600.

Answer: A.

Some work problems with solutions:
time-n-work-problem-82718.html?hilit=reciprocal%20rate
facing-problem-with-this-question-91187.html?highlight=rate+reciprocal
what-am-i-doing-wrong-to-bunuel-91124.html?highlight=rate+reciprocal
gmat-prep-ps-93365.html?hilit=reciprocal%20rate
questions-from-gmat-prep-practice-exam-please-help-93632.html?hilit=reciprocal%20rate
a-good-one-98479.html?hilit=rate

Hope it helps.


Hi Bunnel,

I have always one confusion in rate and work problems can you please clarify this?,

When do we add rates i.e what you did above...... 24(a+b)=x;

and when do we divide by rates i.e something . rate =(Job done/ time)

Regards

Srinath


You can denote rate directly by some variable (a in the solution) or express rate as a reciprocal of time. For example, say printer A needs t minutes to print 1 page and printer B needs m minutes to print 1 page, then the rate of printer A would be job/time=1/t pages per minute and the rate of printer B would be 1/m pages per minute (rate is a reciprocal of time, so 1/t=a and 1/m=b). In this case the equation would be 24(1/t+1/m)=x.

Hope it's clear.
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RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: Working together, printer A and printer B would finish the [#permalink] New post 08 Sep 2012, 04:51
First thing i did was i found out time that is required to B to complete the task alone: 1/24-1/60=3/120=1/40. Then i looked at the information which states that the rate of B is 5+ page than that of A so, lets say x is the number of pages printed by A per minute, so the task consists of 60*x or 40*(x+5) pages. I can make an equation: 60x=40(x+5), 20x=200, x=10, total number of pages is 60*10=600 or 40*15=600

Answer is A.

It is clear but it took me about 3 min to do it, does it because i am doing it slow or i am using longer route?
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Re: Working together, printer A and printer B would finish the [#permalink] New post 15 Nov 2012, 04:37
\frac{1}{A}=\frac{1}{60}
\frac{1}{B}+\frac{1}{A}=\frac{1}{24}

Get: \frac{1}{B}

\frac{1}{B}=\frac{1}{24}-\frac{1}{60}=\frac{1}{40}

Let p be the number of pages produced by A.
Let p+5 be the number of pages produced by B.

24(p + p+5) = 60(p)==> p=10pages

Answer: 60(p)=600pages
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Re: Working together, printer A and printer B would finish the [#permalink] New post 03 Mar 2013, 23:40
gauravnagpal wrote:
Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?

A. 600
B. 800
C. 1000
D. 1200
E. 1500

[Reveal] Spoiler:
I know this question is relatively symol if make an equation in one vaibale ...
I tried to do it by applying the fundamental of A = Jobs per min * time ( the way we typically solve the work problems ) and i was stuck

I did jobs per minute A , 1/60
combined rate = 1/24

so rate of b = 1/24 - 1/60 = 1/40

but could not arrive at the solution ... i tried to form the equation by assuming x as the total numbe of pages So x/60+ x+5/40 = cld nt take ot forward from here
kindly see where am I losing the track !


total time taken by B = 24 * 60 / (60 -24) = 40 min.

A take 60 min. B takes 40 min to complete a task.

Now, divide the values given in option (in Ans) to get the rate per min.

option A: 600 / 10 = 60 & 600/40 = 15...> this satisfies the condition given in question stem that printer B prints 5 pages a minute more than printer A ?
. therefore A
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Re: Working together, printer A and printer B would finish the [#permalink] New post 21 Sep 2013, 10:31
Ta = 60min
Ra = 1/Ta = 1/60
Rb = 1/Tb

Combined task completion time 24min.
=Ra + Rb
=1/60 + 1/Tb = 1/24
Tb = 40 min.

Ra = X/Ta Rb = X/Tb

Ra + 5 = Rb
X/Ta + 5 = X/Tb
X/60 + 5 = X/40
X=600 Ans.
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Re: Working together, printer A and printer B would finish the [#permalink] New post 25 Sep 2013, 03:09
mbaiseasy wrote:
Let p be the number of pages produced by A.
Let p+5 be the number of pages produced by B.

24(p + p+5) = 60(p)==> p=10pages

Answer: 60(p)=600pages



How do you come up with these??
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Re: solution required [#permalink] New post 20 Nov 2013, 15:01
Bunuel wrote:
gauravnagpal wrote:
.Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?

a. 600
b. 800
c. 1000
d. 1200
e. 1500

answer: A
I know this question is relatively symol if make an equation in one vaibale ...
I tried to do it by applying the fundamental of A = Jobs per min * time ( the way we typically solve the work problems ) and i was stuck

I did jobs per minute A , 1/60
combined rate = 1/24

so rate of b = 1/24 - 1/60 = 1/40

but could not arrive at the solution ... i tried to form the equation by assuming x as the total numbe of pages So x/60+ x+5/40 = cld nt take ot forward from here
kindly see where am I losing the track !


Let the rate of printer A be a pages per minute, the rate of printer B be b pages per minute and whole task be x pages.

time*rate=job \ done:

Working together, printer A and printer B would finish the task in 24 minutes" --> 24(a+b)=x;
Printer A alone would finish the task in 60 minutes --> 60a=x;
Printer B prints 5 pages a minute more than printer A --> b=a+5.

Solving for x --> x=600.

Answer: A.

Some work problems with solutions:
time-n-work-problem-82718.html?hilit=reciprocal%20rate
facing-problem-with-this-question-91187.html?highlight=rate+reciprocal
what-am-i-doing-wrong-to-bunuel-91124.html?highlight=rate+reciprocal
gmat-prep-ps-93365.html?hilit=reciprocal%20rate
questions-from-gmat-prep-practice-exam-please-help-93632.html?hilit=reciprocal%20rate
a-good-one-98479.html?hilit=rate

Hope it helps.



I'm curious about the 1/a+1/b=1/24 solution as well. I started out trying that way and got stuck at the same point as the other fellow. Is there any way to solve it once you have 1/60+1/40 for their combined rates? Or is that just a dead end?


edit: Also, question #2:

Shouldn't the equation be 24(1/a+1/b)=x; ? Since you have 24 minutes in which the machines are working at their individual rates, doing 1/a and 1/b of the job per minute? I don't get how one can know when to arbitrarily use "a" instead of '1/a" or "b" instead of "1/b"
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Re: solution required [#permalink] New post 21 Nov 2013, 01:40
1
This post received
KUDOS
Expert's post
AccipiterQ wrote:
Bunuel wrote:
gauravnagpal wrote:
.Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?

a. 600
b. 800
c. 1000
d. 1200
e. 1500

answer: A
I know this question is relatively symol if make an equation in one vaibale ...
I tried to do it by applying the fundamental of A = Jobs per min * time ( the way we typically solve the work problems ) and i was stuck

I did jobs per minute A , 1/60
combined rate = 1/24

so rate of b = 1/24 - 1/60 = 1/40

but could not arrive at the solution ... i tried to form the equation by assuming x as the total numbe of pages So x/60+ x+5/40 = cld nt take ot forward from here
kindly see where am I losing the track !


Let the rate of printer A be a pages per minute, the rate of printer B be b pages per minute and whole task be x pages.

time*rate=job \ done:

Working together, printer A and printer B would finish the task in 24 minutes" --> 24(a+b)=x;
Printer A alone would finish the task in 60 minutes --> 60a=x;
Printer B prints 5 pages a minute more than printer A --> b=a+5.

Solving for x --> x=600.

Answer: A.

Some work problems with solutions:
time-n-work-problem-82718.html?hilit=reciprocal%20rate
facing-problem-with-this-question-91187.html?highlight=rate+reciprocal
what-am-i-doing-wrong-to-bunuel-91124.html?highlight=rate+reciprocal
gmat-prep-ps-93365.html?hilit=reciprocal%20rate
questions-from-gmat-prep-practice-exam-please-help-93632.html?hilit=reciprocal%20rate
a-good-one-98479.html?hilit=rate

Hope it helps.



I'm curious about the 1/a+1/b=1/24 solution as well. I started out trying that way and got stuck at the same point as the other fellow. Is there any way to solve it once you have 1/60+1/40 for their combined rates? Or is that just a dead end?


edit: Also, question #2:

Shouldn't the equation be 24(1/a+1/b)=x; ? Since you have 24 minutes in which the machines are working at their individual rates, doing 1/a and 1/b of the job per minute? I don't get how one can know when to arbitrarily use "a" instead of '1/a" or "b" instead of "1/b"


In this case we'd have:
The rate of printer A = 1/a pages per minute, where a is the time to print 1 page.
The rate of printer B = 1/b pages per minute, where b is the time to print 1 page.

Working together, printer A and printer B would finish the task in 24 minutes" --> 24(\frac{1}{a}+\frac{1}{b})=x;
Printer A alone would finish the task in 60 minutes --> 60*\frac{1}{a}=x;
Printer B prints 5 pages a minute more than printer A --> \frac{1}{b}=\frac{1}{a}+5.

Solving for x --> x=600.

Answer: A.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: Working together, printer A and printer B would finish the [#permalink] New post 18 Mar 2014, 06:00
Rate A= X
Rate B= X+5

Work(A)=> X * 60 = 60X

Rate(A+B) * 24 = Work

(2X+5) * 24 = 60X

X=10
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Re: Working together, printer A and printer B would finish the   [#permalink] 18 Mar 2014, 06:00
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