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The s subjects in an experiment are divided into 4 groups [#permalink]

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04 Mar 2012, 11:47

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The s subjects in an experiment are divided into 4 groups: 3 test groups and a control. If each group is further divided into units consisting of u subjects each, with each unit assigned to a different researcher, how many researchers are assigned to units?

Re: The s subjects in an experiment are divided into 4 groups [#permalink]

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04 Mar 2012, 14:34

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Try to ignore the 4 groups part, that is extraneous infromation. This is because each of the 4 groups are further divided n groups(n is unknown).

Initially you have s subjects, they are finally divided into n units with each unit has u subjects. Thus number of units n = s/u. Now each unit has 1 researcher. Thus number of units = number of researchers. Thus number of researchers = s/u.
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Re: The s subjects in an experiment are divided into 4 groups [#permalink]

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27 Apr 2015, 21:28

Hello from the GMAT Club BumpBot!

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Re: The s subjects in an experiment are divided into 4 groups [#permalink]

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31 May 2015, 08:30

Assuming the subjects are 32 (S=32). Divided into 4 groups. Each group has 8 members. Now if each group is further divided into 2 subjects each (U=2). There would be 12 units in total. One researcher per unit means 12 Researchers in total. plugging in values of S=32 and U=2 gives us 16 in A.

However when we pick U=8; there are 4 researchers now and A) gives us S/U =32/8=4.

Re: The s subjects in an experiment are divided into 4 groups [#permalink]

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01 Jun 2015, 01:41

Although the question has been answered before there are certain confusions.

If we pick numbers say S=32. Then there would be 4 groups of 8. if u=2 then there should be 12 units and same no of researchers. In the OA S/U gives 32/2= 16.

On the other hand when we select S= 32, U=8. the OA gives researchers equal 4 and that is understandable. Why are we getting two answers by the same strategy of picking numbers?

Re: The s subjects in an experiment are divided into 4 groups [#permalink]

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02 Jun 2015, 00:42

Gmatdecoder wrote:

Although the question has been answered before there are certain confusions.

If we pick numbers say S=32. Then there would be 4 groups of 8. if u=2 then there should be 12 units and same no of researchers. In the OA S/U gives 32/2= 16.

On the other hand when we select S= 32, U=8. the OA gives researchers equal 4 and that is understandable. Why are we getting two answers by the same strategy of picking numbers?

Any one?

If S=32, then their are 4 groups of 8. If u=2, then their are 4 units (8/2=4) for each of 4 group. So total number of units is 4*4=16.

Although the question has been answered before there are certain confusions.

If we pick numbers say S=32. Then there would be 4 groups of 8. if u=2 then there should be 12 units and same no of researchers. In the OA S/U gives 32/2= 16.

On the other hand when we select S= 32, U=8. the OA gives researchers equal 4 and that is understandable. Why are we getting two answers by the same strategy of picking numbers?

In case where s = 32 and u = 2, assuming equal distribution between \(4\) groups i.e. \(\frac{32}{4} = 8\) subjects in each group, you will have the following number of researchers in each group:

Test Group 1 test group will have \(\frac{8}{2} = 4\) researchers. Therefore \(3\) test groups will have \(= 4* 3 = 12\) researchers

Control group 1 Control group will have \(= \frac{8}{2} = 4\) researchers.

Therefore total researchers \(= 12 + 4 = 16\) which is the same as \(\frac{s}{u} = \frac{32}{2} = 16\)

Re: The s subjects in an experiment are divided into 4 groups [#permalink]

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11 Aug 2017, 04:32

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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