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In 1979 approximately 1/3 of the 37.3 million airline passengers trave

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In 1979 approximately 1/3 of the 37.3 million airline passengers trave  [#permalink]

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New post 02 Nov 2015, 08:45
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

83% (01:49) correct 17% (02:48) wrong based on 50 sessions

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In 1979 approximately 1/3 of the 37.3 million airline passengers traveling to or from the United States used Kennedy Airport. If the number of such passengers that used Miami Airport was 1/2 the number that used Kennedy Airport and 4 times the number that used Logan Airport, approximately how many millions of these passengers used Logan Airport that year?

(A) 18.6
(B) 9.3
(C) 6.2
(D) 3.1
(E) 1.6

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In 1979 approximately 1/3 of the 37.3 million airline passengers trave  [#permalink]

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New post 02 Nov 2015, 11:08
number of
passengers using Kennedy airport = 37/3 =~12.43
Passengers using Miami airport = 12.43/2=~6.2
passengers using logan airport = 6.2/4 =~1.54

so E
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Re: In 1979 approximately 1/3 of the 37.3 million airline passengers trave  [#permalink]

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New post 01 Jan 2019, 16:24
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Bunuel wrote:
In 1979 approximately 1/3 of the 37.3 million airline passengers traveling to or from the United States used Kennedy Airport. If the number of such passengers that used Miami Airport was 1/2 the number that used Kennedy Airport and 4 times the number that used Logan Airport, approximately how many millions of these passengers used Logan Airport that year?

(A) 18.6
(B) 9.3
(C) 6.2
(D) 3.1
(E) 1.6


This question illustrates the importance of ALWAYS checking the answer choices BEFORE getting bogged down with time-consuming calculations.
For more on this important strategy, you can watch the video below

Since the answer choices are VERY spread apart, we can be quite aggressive in our rounding and estimation.

In 1979 approximately 1/3 of the 37.3 million airline passengers traveling to or from the United States used Kennedy Airport.
Let's say that "In 1979 approximately 1/3 of the 36 million airline passengers traveling to or from the United States used Kennedy Airport. "
1/3 of 36 = 12
So, 12 million passengers used Kennedy Airport

The number of such passengers that used Miami Airport was 1/2 the number that used Kennedy Airport
12 million passengers used Kennedy Airport
1/2 of 12 million = 6 million
So, 6 million passengers used Miami Airport

The number of such passengers that used Miami Airport was 4 times the number that used Logan Airport
In other words, the number of such passengers that used Logan Airport was 1/4 the number that used Miami Airport
1/4 of 6 million = 1.5 million

So, 1.5 million passengers used Logan Airport

Check the answer choices . . . only answer choice E is close to 1.5

Answer: E

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Re: In 1979 approximately 1/3 of the 37.3 million airline passengers trave   [#permalink] 01 Jan 2019, 16:24
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