单项选择题

Alison is now three times as old as Jeremy, but 5 years ago, she was 5 times as old as he was. How old is Alison now？（）

A.10
B.12
C.24
D.30
E.36

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单项选择题
For what value of x is 82x-4 = 16x？（）

A.2
B.3
C.4
D.6
E.8
单项选择题
If x and y are integers such that x3 = y2, which of the following could not be the value of y？（）

A.-1
B.1
C.8
D.16
E.27
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