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

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Kudos [?]: 63 [1] , given: 212

The s subjects in an experiment are divided into 4 groups [#permalink]  04 Mar 2012, 11:47
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20% (00:00) correct 80% (02:49) wrong based on 1 sessions
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

[Reveal] Spoiler: OA

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Kudos [?]: 198 [1] , given: 116

Re: Subject & Researchers [#permalink]  04 Mar 2012, 14:34
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KUDOS
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, 14:34
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