单项选择题

If the value of the expression above is to be halved by doubling exactly one of the five numbers a，b，C，d，or e，which should be doubled（）

A. a
B. b
C. c
D. d
E. e

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单项选择题

Pencils have the same unit cost regardless of the number sold．x pencils cost a total of $0.5，and n pencils cost a total of y dollar．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

单项选择题

On the number line above，what number correspnds to a point that is of the distance from 10 to 40（）

A. 6
B. 8
C. 12
D. 15
E. 22