This semester, each of the 90 students in a certain class

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This semester, each of the 90 students in a certain class [#permalink]

11 Nov 2006, 06:49

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This semester, each of the 90 students in a certain class took at least one course from A, B, and C. If 60 students took A, 40 students took B, 20 students took C, and 5 students took all the three, how many students took exactly two courses?

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Re: PS[sets] [#permalink]

11 Nov 2006, 07:30

90=60+40+20-(two class)+5
two class =35
only two class =35-3*5=20

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11 Nov 2006, 07:46

Only A = 60 - 5 - AB - AC = 55 - AB - AC
Only B = 40 - 5 - AB - BC = 35 - AB - BC
Only C = 20 - 5 - AC - BC = 15 - AC - BC

(55- AB - AC) + (35-AB-BC) + (15-AC-BC) + 5 + AB + AC + BC = 90
110 - AB - AC - BC = 90
AB+ AC+BC =20

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Re: This semester, each of the 90 students in a certain class [#permalink]

04 Dec 2012, 23:47

Could someone explain this part?

only two class =35-3*5=20

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Re: This semester, each of the 90 students in a certain class [#permalink]

05 Dec 2012, 03:12

anon1 wrote:

Could someone explain this part?

only two class =35-3*5=20

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Re: This semester, each of the 90 students in a certain class [#permalink] 05 Dec 2012, 03:12

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This semester, each of the 90 students in a certain class

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This semester, each of the 90 students in a certain class

This semester, each of the 90 students in a certain class

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