[計量] If the total number of commuters ...
If the total number of commuters to County W is
twice the number to County Z, and if the average
number of vehicles that transport commuters daily
to County W is 30,000, what is the approximate
average number of vehicles that transport
commuters daily to County Z.
(A)12,000
(B)15,000
(C)18,000
(D)27,000
(E)36,000
Ans: (A)
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