单项选择题

If w widgets cost c cents, how many widgets can you get for d dollars（）

A.A
B.B
C.C
D.D
E.E

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单项选择题

If 120% of a is equal to 80% of b, which of the following is equal to a + b（）

A.1.5a
B.2a
C.2.5a
D.3a
E.5a

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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