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In 1990 a total of x earthquakes occurred worldwide, some but not all

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Joined: 05 Mar 2015
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In 1990 a total of x earthquakes occurred worldwide, some but not all [#permalink]

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New post Updated on: 01 Apr 2015, 02:47
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In 1990 a total of x earthquakes occurred worldwide, some but not all of which occurred in Asia. If m o f these earthquakes occurred in Asia, which of the following represents the ratio of the number of earthquakes that occurred in Asia to the number that did NOT occur in Asia?

A) x/m
B) m/x
C) m/(x-m)
D) x/(x-m)
E) 1- (m/x)

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Originally posted by NYCgirl15 on 01 Apr 2015, 02:37.
Last edited by Bunuel on 01 Apr 2015, 02:47, edited 4 times in total.
Renamed the topic and added the OA.
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Re: In 1990 a total of x earthquakes occurred worldwide, some but not all [#permalink]

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New post 01 Apr 2015, 02:50
1
NYCgirl15 wrote:
In 1990 a total of x earthquakes occurred worldwide, some but not all of which occurred in Asia. If m o f these earthquakes occurred in Asia, which of the following represents the ratio of the number of earthquakes that occurred in Asia to the number that did NOT occur in Asia?

A) x/m
B) m/x
C) m/(x-m)
D) x/(x-m)
E) 1- (m/x)


if m occurred in Asia then x-m occurred in ROW .
\(\frac{m}{x-m}\)
Answer C
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Re: In 1990 a total of x earthquakes occurred worldwide, some but not all [#permalink]

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New post 01 Apr 2015, 21:48
Hi NYCgirl15,

You can treat this question 'conceptually', using variables and logic to get to the answer. You can also TEST VALUES to get to the solution.

We're given a couple of facts to work with:
1) There were a total of X earthquakes
2) Of those earthquakes, M of them occurred in Asia

We're asked for the ratio of the number of earthquakes that occurred IN ASIA to the number of earthquakes that DID NOT occur in Asia.

Let's TEST VALUES
X = 5 total earthquakes
M = 2 occurred in Asia

Thus, there were 3 earthquakes that DID NOT occur in Asia....

The answer to the question is 2:3
We just need to plug in the values for X and M and find the match...

Answer A: X/M = 5/2 NOT a match
Answer B: M/X = 2/5 NOT a match
Answer C: M/(X-M) = 2/(5-2) = 2/3 This IS a match
Answer D: X/(X-M) = 5/(5-2) = 5/3 NOT a match
Answer E: 1 - (M/X) = 1-2/5 = 3/5 NOT a match

Final Answer:

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Re: In 1990 a total of x earthquakes occurred worldwide, some but not all [#permalink]

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New post 21 Mar 2018, 16:21
NYCgirl15 wrote:
In 1990 a total of x earthquakes occurred worldwide, some but not all of which occurred in Asia. If m o f these earthquakes occurred in Asia, which of the following represents the ratio of the number of earthquakes that occurred in Asia to the number that did NOT occur in Asia?

A) x/m
B) m/x
C) m/(x-m)
D) x/(x-m)
E) 1- (m/x)


Since there are m earthquakes that occurred in Asia and there are x earthquakes that occurred worldwide, there are (x - m) earthquakes that occurred outside of Asia. Thus, the ratio of earthquakes that occurred in Asia to those that did not occur in Asia is m/(x - m).

Answer: C
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Re: In 1990 a total of x earthquakes occurred worldwide, some but not all   [#permalink] 21 Mar 2018, 16:21
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