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A bottle manufacturing company has 5 machines, each of which

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A bottle manufacturing company has 5 machines, each of which [#permalink] New post 23 Jan 2013, 18:22
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A bottle manufacturing company has 5 identical machines, each of which produces bottles at the same constant rate. How many bottles will all 5 machines produce running simultaneously for x hours?

(1) Running simultaneously, 3 of the machines produce 72,000 bottles in 2x hours?

(2) Running simultaneously, 2 of the machines produce 24,000 bottles in x hours?
[Reveal] Spoiler: OA

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Re: A bottle manufacturing company has 5 machines, each of which [#permalink] New post 23 Jan 2013, 18:58
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Statement 1: 72000 for 2x hours...reduces to 36000 for x hours. Since rates of each machine is the same 36000/3 = 12000 bottles per machine for x hours. Therefore, 12000 x 5 = 60 000 bottles produced by 5 machines in x hourse. Sufficient.

Statement 2: If 2 of the machines working at the same rate produce 24000 bottles in x hours, that must mean 12000 bottles are produced per machine. Again, 60 000 bottles must be produced from 5 machines in x hours. Sufficient.
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Re: A bottle manufacturing company has 5 machines, each of which [#permalink] New post 23 Jan 2013, 19:44
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megafan wrote:
A bottle manufacturing company has 5 identical machines, each of which produces bottles at the same constant rate. How many bottles will all 5 machines produce running simultaneously for x hours?

(1) Running simultaneously, 3 of the machines produce 72,000 bottles in 2x hours?

(2) Running simultaneously, 2 of the machines produce 24,000 bottles in x hours?


Once you have the bottles produced by 1 machine in x hours, you can easily find the bottles produced by 5 machines in x hrs. Each statement independently gives you the bottles produced by 1 machine in x hrs so each statement alone is sufficient.

Though you don't need to find the actual number of bottles in this case, if you do need to in PS questions, you can use a quick one step process for such work problems. The advantage of doing it in one step is that sometimes, these fractions cancel each other out and your calculations are reduced.

Question: 3 of the machines produce 72,000 bottles in 2x hours. How many bottles will all 5 machines produce running simultaneously for x hours?

You need to find the number of bottles. So

72000 *

2x hrs becomes x hrs. The number of hrs has reduced so number of bottles made will reduce. You multiply 72000 by a number less than 1.

72000 * (1/2)

3 machines have become 5 machines. More machines will make more bottles. So multiply by 5/3, a number more than 1.

72000 * (1/2) * (5/3) = 60,000
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Re: A bottle manufacturing company has 5 machines, each of which [#permalink] New post 04 Mar 2013, 01:00
megafan wrote:
A bottle manufacturing company has 5 identical machines, each of which produces bottles at the same constant rate. How many bottles will all 5 machines produce running simultaneously for x hours?

(1) Running simultaneously, 3 of the machines produce 72,000 bottles in 2x hours?

(2) Running simultaneously, 2 of the machines produce 24,000 bottles in x hours?


St 1: 3 * 2x * Rate per machine = 72000====> Rate per machine = 12000/ x

Therefore, work done in x hrs by 5 machines = 12000/x * 5x = 60000

St2: Same process can be followed with this statement.

therefore, D
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Re: A bottle manufacturing company has 5 machines, each of which [#permalink] New post 04 Mar 2013, 01:11
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megafan wrote:
A bottle manufacturing company has 5 identical machines, each of which produces bottles at the same constant rate. How many bottles will all 5 machines produce running simultaneously for x hours?

(1) Running simultaneously, 3 of the machines produce 72,000 bottles in 2x hours?

(2) Running simultaneously, 2 of the machines produce 24,000 bottles in x hours?


Let the rate of each machine be r. Thus we have to find out the value of 5*r*x. Thus, it is sufficient to find the value ofr*x.

F.S 1 states that 3*r*2x = 72000. No need to calculate anything, as we know the value ofr*x. Sufficient.

F.S 2 states that 2*r*x = 24000. Just as above, Sufficient.

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Re: A bottle manufacturing company has 5 machines, each of which   [#permalink] 04 Mar 2013, 01:11
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