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PS: Geese Migration

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SVP
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PS: Geese Migration  [#permalink]

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New post 08 Dec 2008, 17:52
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Simple but intresting.

A total of 30 percent of the geese included in a certain migration study were male. If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese?

A. 1/4
B. 7/12
C. 2/3
D. 7/8
E. 8/7

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Re: PS: Geese Migration  [#permalink]

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New post 08 Dec 2008, 18:13
B - 7/12

1/3 : 4/7 = 7/12

What is the OA ?
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Re: PS: Geese Migration  [#permalink]

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New post 08 Dec 2008, 20:39
Thats the OA.
Quote:
B. 7/12

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Re: PS: Geese Migration  [#permalink]

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New post 08 Dec 2008, 20:58
LiveStronger wrote:
B - 7/12

1/3 : 4/7 = 7/12

What is the OA ?


Can you explain why 1/3 : 4/7

My approach:

Male: Total - Migrated: 0.3X - 0.2Y
Female: Total - Migrated: 0.7X - 0.8Y

Migration rate = Migrated / Total
ratio of the migration rate for the male geese to the migration rate for the female geese
= Migration rate of male / migration rate of female = (0.2Y/0.3X) / (0.8Y/0.7X)
= 2/3 : 8/7 = 14/24 = 7/12
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Re: PS: Geese Migration  [#permalink]

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New post 09 Dec 2008, 04:50
I went the same, but I used numbers, Total = 100, Migrated = 50

2/3:8:7 = 1/3:4/7

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Re: PS: Geese Migration &nbs [#permalink] 09 Dec 2008, 04:50
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