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Twenty-four men can complete a work in sixteen days.Thirty-two women c

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Joined: 31 Dec 2017
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Concentration: Finance
Re: Twenty-four men can complete a work in sixteen days.Thirty-two women c  [#permalink]

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New post 14 Jan 2018, 18:00
Chemerical71 wrote:
Twenty-four men can complete a work in sixteen days.Thirty-two women can complete the same work in twenty-four days.Sixteen men and sixteen women started working for twelve days.How many more men are to be added to complete the work remaining work in 2 days?

A .16
B. 24
C. 36
D. 48
E. 54


Total work \(= 24m*16d = 384md\), or \(32w * 24d = 768wd\).

\(24m * 16d = 32w * 24d\)
\(1md = 2wd\): men are twice as efficient as women.

Work done by \(16m\) and \(16w\) in \(12\) days \(= 12(32wd + 16wd) = 576wd\).

Remaining work \(= 768-576 = 192 wd\), can be completed in \(2\) days by \(\frac{192}{2} = 96w\).

\(96w - 48w = 48w = 24m\). Ans - B.
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Re: Twenty-four men can complete a work in sixteen days.Thirty-two women c  [#permalink]

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New post 12 Feb 2018, 10:03
Abhishek009 wrote:
Chemerical71 wrote:
Twenty-four men can complete a work in sixteen days.Thirty-two women can complete the same work in twenty-four days.Sixteen men and sixteen women started working for twelve days.How many more men are to be added to complete the work remaining work in 2 days?

A .16
B. 24
C. 36
D. 48
E. 54


Quote:
Twenty-four men can complete a work in sixteen days.


So, Total mandays = 24*16 => 384

Quote:
Thirty-two women can complete the same work in twenty-four days.


So, Total womandays = 32*24 => 768

Now, total work = LCM( 384,768 ) => 768

So, Efficiency of men = 2 & Efficiency of women = 1

Quote:
Sixteen men and sixteen women started working for twelve days.


Work completed = (16*2 + 16*1 )12 => 576 units , Work left = 768 - 576 => 192

Quote:
How many more men are to be added to complete the work remaining work in 2 days?


\({(16+m)*2 + 16*1 }*2 = 192\)

Or, \((16+m)*2 + 16 = 96\)

Or, \((16+m) = 40\)

Or, \(m = 24\)

Thus, we need to add , 24 more men workers, answer must be (B) 24 men...








{(16+m)*2 + 16*1 }*2 = 192
Why have you not multiplied mans efficiency here?
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Re: Twenty-four men can complete a work in sixteen days.Thirty-two women c  [#permalink]

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New post 25 Mar 2018, 23:04
24m*16=32w*24
m=2w
16m+16w=48w
48w 12 dasy works =12*48/32*24
=3/4
the rest =1/4
1/4 works in 2 days need
=48*12*4/3*4*2
=96 w
2w = 1 m
96w=48 m
here original m 24
so extra m 48-24
24

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Re: Twenty-four men can complete a work in sixteen days.Thirty-two women c  [#permalink]

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New post 09 Sep 2018, 08:18
Chemerical71 wrote:
Twenty-four men can complete a work in sixteen days.Thirty-two women can complete the same work in twenty-four days.Sixteen men and sixteen women started working for twelve days.How many more men are to be added to complete the work remaining work in 2 days?

A .16
B. 24
C. 36
D. 48
E. 54


Nice problem!

Let´s suppose each man does 1 task/day , and each woman does k tasks/day (where k>0, not necessarily an integer).

By the question stem, we know that:

> 24 men do 1 work in 16 days, hence 1 work = 24*16 tasks (1)
> 32 women do 1 work in 24 days, hence 1 work = 32*24*k tasks implies, by (1) above, that k = 1/2

> 16 men and 16 women will do in 12 days exactly 16*12*1 + 16*12*1/2 = 24*12 tasks, therefore by (1) we have still 24*(16-12) = 24*4 tasks to be done.

> If x is the number of men to be added (our FOCUS), we have a group of (16+x) men and 16 women performing (16+x)*1 + 16*1/2 = (24+x) tasks/day,
and the final touch is done with UNITS CONTROL, one of our method´s most powerful tools:

\(24 \cdot 4\,\,\,{\text{tasks}}\,\,\, = \,\,2\,\,days\,\,\left( {\frac{{24 + x\,\,\,{\text{tasks}}}}{{1\,\,\,{\text{day}}}}\,\,\,\begin{array}{*{20}{c}}
\nearrow \\
\nearrow
\end{array}} \right)\,\,\,\,\,\, \Rightarrow \,\,\,\,\,24 + x = 24 \cdot 2\,\,\,\,\, \Rightarrow \,\,\,\,\,\,? = x = 24\)

Obs.: arrows indicate licit converters.

(If you realize this solution is absolutely clear and safe, you are the perfect candidate for our method... try our free and super-complete test drive!)


This solution follows the notations and rationale taught in the GMATH method.

Regards,
fskilnik.
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Re: Twenty-four men can complete a work in sixteen days.Thirty-two women c  [#permalink]

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New post 10 Nov 2018, 20:16
24 men will take 16 days.
1 man will take 384 days.
32 women will take 24 days.
1 women will take 768 days.

Therefore, 1 women's work rate is equal to 0.5 man.

16 man + 16 women = 24 man.
So, they will require 4 more days with the same manpower. If they double the manpower they can complete the work in 2 days.

Therefore, another 24 men are required.
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Re: Twenty-four men can complete a work in sixteen days.Thirty-two women c &nbs [#permalink] 10 Nov 2018, 20:16

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