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Worldwide production of motor vehicles was 3.9 million vehicles in 194

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Worldwide production of motor vehicles was 3.9 million vehicles in 194  [#permalink]

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New post 23 Nov 2015, 13:30
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

48% (01:32) correct 52% (01:42) wrong based on 43 sessions

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Worldwide production of motor vehicles was 3.9 million vehicles in 1946 and 45.7 million in 1987. Of the following, which is closest to the average (arithmetic mean) annual increase, in millions, in worldwide production of motor vehicles during this period?

(A) 0.08
(B) 1.0
(C) 1.1
(D) 10.5
(E) 41.8

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Re: Worldwide production of motor vehicles was 3.9 million vehicles in 194  [#permalink]

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New post 23 Nov 2015, 13:56
1
answer should be B

the wording is complicated but the principle is simple

First, 45.7-3.9= 41.8
Now we are told that in 46 there were 3.9 and that in 87 there were 45.7, so to find the average anual increase we must include the years that have suffered an increase, and these ones are 47....87 included which give us 87-47+1=41

average=totalsum/total numbers

41.8/41 gives very close to 1.

ANS B
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Re: Worldwide production of motor vehicles was 3.9 million vehicles in 194  [#permalink]

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New post 23 Nov 2015, 19:02
Bunuel wrote:
Worldwide production of motor vehicles was 3.9 million vehicles in 1946 and 45.7 million in 1987. Of the following, which is closest to the average (arithmetic mean) annual increase, in millions, in worldwide production of motor vehicles during this period?

(A) 0.08
(B) 1.0
(C) 1.1
(D) 10.5
(E) 41.8


Change in production of motor vehicles = 45.7 - 3.9 = 41.8 million in 41 years (1987 - 1946)
average increase per year = 41.8/41 = 1 million (apporx.)

Answer (B)
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Re: Worldwide production of motor vehicles was 3.9 million vehicles in 194  [#permalink]

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New post 19 Aug 2018, 09:44
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Re: Worldwide production of motor vehicles was 3.9 million vehicles in 194   [#permalink] 19 Aug 2018, 09:44
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