单项选择题

The scores reported for a certain multiple—choice test were dcrived by subtractingof the number of wrong answers from the number of right answers．On a 40-questiontest，if none of the questions was omitted and the score reported was 20，how many wrong answers were there？（）

A. 5
B. 10
C. 15
D. 25
E. 30

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单项选择题
Mechanical toy cars A，B，and C，each traveling at its own uniform rate，started from the same point at the same time and raced a 400-meter course．（） When A crossed the finish line．B was 40meters behind A，and C was 58 meters behind A． When B crossed the finish line，how many meters was C from the finish line

A. 16
B. 18
C. 19
D. 20
E. 22
单项选择题
Art，Bob，and Carmen share a prize of$400．If Art receives twice as much as Bob，and if Bob receives as much as Carmen，how much does Carmen receive？（）

A. $20
B. $40
C. $80
D. $140
E. $160
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