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The s subjects in an experiment are divided into 4 groups

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Concentration: International Business, Strategy
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The s subjects in an experiment are divided into 4 groups [#permalink] New post 04 Mar 2012, 10:47
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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?
(A) \frac{s}{u}
(B) \frac{u}{s}
(C) \frac{3s}{u}
(D) \frac{4s}{u}
(E) 4u

I am struggling to solve this. Can someone please help?
[Reveal] Spoiler: OA

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Re: Subject & Researchers [#permalink] New post 04 Mar 2012, 13:34
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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: Subject & Researchers   [#permalink] 04 Mar 2012, 13:34
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The s subjects in an experiment are divided into 4 groups

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