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# A traffic survey shows that, of every 12 cars that arrive at point A

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Math Expert
Joined: 02 Sep 2009
Posts: 50652
A traffic survey shows that, of every 12 cars that arrive at point A  [#permalink]

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12 Nov 2017, 09:08
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:09) correct 0% (00:00) wrong based on 16 sessions

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A traffic survey shows that, of every 12 cars that arrive at point A, 7 turn toward point B and 5 turn toward point C. Of every 7 cars that arrive at point B, 3 turn toward point D and 4 turn toward point E. Of 48 cars arriving at point A, how many are expected to turn toward point B?

(A) 15
(B) 20
(C) 28
(D) 30
(E) 36

Attachment:

2017-11-12_2101.png [ 95.17 KiB | Viewed 679 times ]

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Re: A traffic survey shows that, of every 12 cars that arrive at point A  [#permalink]

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12 Nov 2017, 23:37

Since the survey points that of the cars coming towards point A,
$$\frac{7}{12}$$ turn towards point B and
$$\frac{5}{12}$$ of the cars turn towards point C!

Furthermore, the survey points that of the 7 cars coming towards
pt B, $$\frac{3}{7}$$ turn towards point D and $$\frac{4}{7}$$ point towards point E.

The question asks us to find out the total number of cars which point towards pt B.

Since 48 cars arrive at pt A $$\frac{7}{12}*48$$ = 28(Option C) cars are expected to turn towards point B.
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Re: A traffic survey shows that, of every 12 cars that arrive at point A &nbs [#permalink] 12 Nov 2017, 23:37
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