单项选择题

In a certain room，all except 18 of the people are over 50 years of age．If 15 of the people in the room are under 50 years of age，how many people are in the room？（）

A. 27
B. 30
C. 33
D. 36
E. It cannot be determined from theinformation given．

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单项选择题

when of a certain number is added to the number and this sum is subtracted from108．the result is the original number．What is the original number？（）

A. 35
B. 45
C. 54
D.
E. 270

单项选择题

At 9:00 a．m．train T 1eft the train station and two hours later train S left the same station on a parallel track． If train Taver aged 60 kilometers per hour and train Saver aged 75 kilometers per hour until S passed T．at what time did S pass T？（）

A、2:00P.m
B、5:00p.m
C、6:00P.m
D、7:00p.m
E、9:00P.m

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