单项选择题

A time—study specialist has set the production rate for each worker on acerta in job at 22 units every 3 hours．At this rate what is the minimum number of workers that should be put on the job if at least 90 units are to be produced per hour？（）

A. 5
B. 8
C. 12
D. 13
E. 30

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单项选择题
A basket contains a total of 30 apples and pears．If it contains times as many apples as pears，how many pears does it contain？（）

A. 9
B. 10
C. 12
D. 18
E. 20
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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