Problem Solving
试题详情
题目：
Of the 150 houses in a certain development, 60 percent have air- conditioning, 50 percent have a sunporch, and 30 percent have a swimming pool. If 5 of the houses have all three of these amenities and 5 have none of them, how many of the houses have exactly two of these amenities?
选项:
A、Partorian trucking companies currently use triple-trailer trucks only for long trips using major highways, which is the safest kind of trip for large trucks.
B、No matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks.
C、Increased use of triple-trailer trucks would mean that large trucks would account for a smaller proportion of all miles driven on Partoria’s roads than they currently do.
D、In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years.
E、The volume of truck traffic on Partoria’s highways could be reduced by encouraging shippers to use rail transport whenever possible.
答案:
D
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