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# If all machines in a factory are equally efficient and 10 machines

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General GMAT Forum Moderator
Joined: 29 Jan 2015
Posts: 1094
Location: India
WE: General Management (Non-Profit and Government)
If all machines in a factory are equally efficient and 10 machines  [#permalink]

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22 Aug 2018, 09:21
3
00:00

Difficulty:

15% (low)

Question Stats:

82% (01:25) correct 18% (01:29) wrong based on 68 sessions

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If all machines in a factory are equally efficient and 10 machines take 8 seconds to produce 40 cans, how long will it take 12 machines to produce 600 cans?

A- 25 seconds
B- 50 seconds
C- 1 minute and 40 seconds
D- 2 minutes
E- 3 minutes and 20 seconds

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Director
Joined: 20 Feb 2015
Posts: 795
Concentration: Strategy, General Management
Re: If all machines in a factory are equally efficient and 10 machines  [#permalink]

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22 Aug 2018, 12:10
rohan2345 wrote:
If all machines in a factory are equally efficient and 10 machines take 8 seconds to produce 40 cans, how long will it take 12 machines to produce 600 cans?

A- 25 seconds
B- 50 seconds
C- 1 minute and 40 seconds
D- 2 minutes
E- 3 minutes and 20 seconds

$$\frac{M1*D1*H1}{W1}$$ = $$\frac{M2*D2*H2}{W2}$$

substituting the values

$$\frac{10*8}{40}$$= $$\frac{12*t}{600}$$
t=100 seconds=1 minute 40 seconds
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Posts: 619
Re: If all machines in a factory are equally efficient and 10 machines  [#permalink]

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31 Aug 2018, 06:25
rohan2345 wrote:
If all machines in a factory are equally efficient and 10 machines take 8 seconds to produce 40 cans, how long will it take 12 machines to produce 600 cans?

A- 25 seconds
B- 50 seconds
C- 1 minute and 40 seconds
D- 2 minutes
E- 3 minutes and 20 seconds

Excellent opportunity to use UNITS CONTROL, one of our most powerful tools!

(The solution may seem excessively "sophisticated", but it works in much hard/high-level question scenarios!)

$$\boxed{10\,\,mach}\,\,\,\,\, \to \,\,\,\,\frac{{40\,\,{\text{cans}}}}{{8\,\,{\text{s}}}} = \boxed{\frac{{5\,\,{\text{cans}}}}{{1\,\,{\text{s}}}}\,\,\,\begin{array}{*{20}{c}} \nearrow \\ \nearrow \end{array}}$$

$$12\,\,mach\,\,,\,\,\,600\,\,cans\,\,\,\,\, \to \,\,\,\,?\,\,\,:\,\,\,{\text{time}}\,$$

$$12\,\,mach\,\,\,\, = \,\,\,\boxed{10\,\,mach}\,\,\left( {\frac{{12}}{{10}}} \right)\,\,\,\, \to \,\,\,\,\,\boxed{\frac{{5\,\,{\text{cans}}}}{{1\,\,{\text{s}}}}}\,\,\,\frac{{12}}{{10}}\,\,\,\,\,\, \to \,\,\,\,\,\frac{{6\,\,\,{\text{cans}}}}{{1\,\,\,{\text{s}}}}$$

$$? = 600\,\,{\text{cans}}\,\,\,\left( {\frac{{1\,\,s}}{{6\,\,{\text{cans}}}}\,\,\begin{array}{*{20}{c}} \nearrow \\ \nearrow \end{array}} \right)\,\,\, = \,\,\,100\,\,{\text{s}}$$

Obs.: arrows indicate licit converters.

The above follows the notations and rationale taught in the GMATH method.
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Re: If all machines in a factory are equally efficient and 10 machines  [#permalink]

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31 Aug 2018, 09:00
Top Contributor
rohan2345 wrote:
If all machines in a factory are equally efficient and 10 machines take 8 seconds to produce 40 cans, how long will it take 12 machines to produce 600 cans?

A- 25 seconds
B- 50 seconds
C- 1 minute and 40 seconds
D- 2 minutes
E- 3 minutes and 20 seconds

We can also use some number sense to get to the correct answer...

GIVEN: 10 machines take 8 seconds to produce 40 cans
So, 10 machines take 1 second to produce 5 cans (if we divide the work time by 8, then the output is also divided by 8)
So, 1 machines take 1 second to produce 0.5 cans (if we divide the number of machines by 10, then the output is also divided by 10)
So, 12 machines take 1 second to produce 6 cans (if we multiply the number of machines by 12, then the output is also multiplied by 12)

We now know that 12 machines take 1 second to produce 6 cans
We want the 12 machines to make 600 cans.
600/6 = 100
So, 12 machines take 100 seconds to produce 600 cans

100 seconds = 1 minute and 40 seconds.

Answer: C
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Re: If all machines in a factory are equally efficient and 10 machines &nbs [#permalink] 31 Aug 2018, 09:00
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# If all machines in a factory are equally efficient and 10 machines

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