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A total of 30 percent of the geese included in a certain [#permalink]

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05 Jan 2011, 17:45

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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? [Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]

Re: A total of 30 percent of the geese [#permalink]

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05 Jan 2011, 22:05

Let there be 100 geese. Out of these since there were 30% male then there were 70 females, let the number of migrating birds be X, out of the ones migrating 20% were males so .8x where females. so, 7/8 (D)

Re: A total of 30 percent of the geese [#permalink]

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05 Jan 2011, 23:24

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ajit257 wrote:

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? [Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]

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

Let there be g geese, of which 0.3g are male and 0.7g are female Lets say m geese migrated, 0.2m are male and 0.8m are female

Re: A total of 30 percent of the geese [#permalink]

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Re: A total of 30 percent of the geese included in a certain [#permalink]

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