单项选择题
If a + 2b = 14 and 5a + 4b = 16, what is the average (arithmetic mean) of a and b?()
A、1.5
B、2
C、2.5
D、3
E、3.5
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单项选择题
If 5x + 13 = 31, what is the value of?()
A.A
B.B
C.C
D.D
E.E
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