单项选择题
If 12a + 3b = 1 and 7b - 2a = 9, what is the average (arithmetic mean) of a and b()
A.0.1
B.0.5
C.1
D.2.5
E.5
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单项选择题
If x% of y is 10, what is y?()
A.A
B.B
C.C
D.D
E.E
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单项选择题
What is a divided by a% of a?()
A.A
B.B
C.C
D.D
E.E
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