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Re: Approximately how many millions of cars were in Country X in 1994?
[#permalink]
16 Feb 2024, 07:16
car in accidents = Accidents/ ("accidents per cars")
Accidents = 36*10k = 360k
"accidents per cars" <= 4
car in accidents = Accidents/ ("accidents per cars") >= 360k/4 = 90k
Observation: the first time I solved this question, I got confused on the wording of this question, but there where only three numbers to use: 360k accidents, 4 accidents per car, and 11M cars in 1993. Since the question asks for "car in accidents", we have two options: to use 11M; or to use a combination of "4 accidents per car" and 360k accidents. 11M doesnt give any clue about the possible answers in the droplist. the other alternative does. using Dimensional analysis we obtained a option in the droplist: 360k accidents/(4 accidents per car) = 90k cars.