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Of a group of geese in a certain research, 30% is male, and

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vshaunak@gmail.com
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Of a group of geese in a certain research, 30% is male, and [#permalink] New post   12 Jun 2007, 03:01
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Of a group of geese in a certain research, 30% is male, and 20% of the migrating gooses are male. What is the ratio of the male goose migrating rate to the female goose migrating rate?

Answer later....



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Re: Of a group of geese in a certain research, 30% is male, and [#permalink] New post   12 Jun 2007, 05:57
Let there be 100 geese
30 would be male 70 would be female

Let say out of these 50 were migrating
10 would be male 40 would be female.

All ratios can be derived from here. What I dont understand is what is meant by migration rate ?

I would suggest that it means ratio of male geese migrating to ratio of female geese migrating so
1/5 : 4/5 = 1/4 ?

It could also mean the overall proportion of males leaving vs females leaving so that would be
10/30 : 40/70 = 7/12

What is the OA ?
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Re: Of a group of geese in a certain research, 30% is male, and [#permalink] New post   12 Jun 2007, 06:04
first from your question one can infer



.30N =M (male) .70N=F (female)

But your question I think does not properly state migrating geese.
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Re: Of a group of geese in a certain research, 30% is male, and [#permalink] New post   12 Jun 2007, 06:26
Ratio is migrating males to females is 1 to 4.

Now, the ratio of the male migration rate to the female migration rate is something like 2 to 1.375 ??

vshaunak@gmail.com wrote:
Of a group of geese in a certain research, 30% is male, and 20% of the migrating gooses are male. What is the ratio of the male goose migrating rate to the female goose migrating rate?

Answer later....
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Re: Of a group of geese in a certain research, 30% is male, and [#permalink] New post   12 Jun 2007, 07:42
7/12

male goose migrating rate = # migrating males / all males
female goose migrating rate = # migrating females / all females

so male migrating rate / female migrating rate = (1/30) / (4/70) = 7/12
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Re: Of a group of geese in a certain research, 30% is male, and [#permalink] New post   12 Jun 2007, 11:43
I think the question is missing the % of migrating goose or am I overlooking something ?
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Re: Of a group of geese in a certain research, 30% is male, and [#permalink] New post   12 Jun 2007, 12:17
Great work.
OA is 7/12



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Re: Of a group of geese in a certain research, 30% is male, and [#permalink]
12 Jun 2007, 12:17
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