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Re: GRE Math Challenge #30-In the history class that consisted [#permalink]
provide source please
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Re: GRE Math Challenge #30-In the history class that consisted [#permalink]
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Re: GRE Math Challenge #30-In the history class that consisted [#permalink]
1
correct: C
Total_number_of_students: 30
seniors = 3 + 2* juniors
not_junior_and_not_senior = 3/10 * total_number_of_students = 3/10 * 30 = 9 so 30 - 9 = 21 students are seniors or juniors:
21 = seniors + juniors =3 + 2* juniors + juniors = 3 + 3*juniors -> juniors = 6
So there are 6 juniors in the history class. and A and B are equal.
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Re: GRE Math Challenge #30-In the history class that consisted [#permalink]
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