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Re: Of 60 birds found in a certain location, 20 are songbirds an [#permalink]
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When you see a problem like this, make a table

forgive the crappy image, Im super new to this kind of stuff, the top table is supposed to be on the bottom
but we see here, if you just put the numbers where they belong, and place x anywhere on the table really, youll see that the
number of birds that are neither migratory or songbirds is 17+x, which means the minimum value is 17
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Re: Of 60 birds found in a certain location, 20 are songbirds an [#permalink]
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sandy wrote:
Of 60 birds found in a certain location, 20 are songbirds and 23 are migratory. (It is possible for a songbird to be either migratory or not migratory.)

Quantity A
Quantity B
The number of the 60 birds that are neither migratory nor songbirds
16


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.



Total birds = 60..
1) songbirds - 20, so NOT songbirds = 60 - 20 = 40.
2) Migratory - 23, so NOT Migratory = 60 - 23 = 37.

A = birds that are neither migratory nor songbirds
Maximum is when all NOT migratory are NOT songbirds, so 37
Minimum is when none of migratory are songbirds, so 60 - 20 - 23 = 60 - 43 = 17
Thus A>B

A
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Re: Of 60 birds found in a certain location, 20 are songbirds an [#permalink]
HappyMathtutor wrote:
When you see a problem like this, make a table

forgive the crappy image, Im super new to this kind of stuff, the top table is supposed to be on the bottom
but we see here, if you just put the numbers where they belong, and place x anywhere on the table really, youll see that the
number of birds that are neither migratory or songbirds is 17+x, which means the minimum value is 17


Nice
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Re: Of 60 birds found in a certain location, 20 are songbirds an [#permalink]
HappyMathtutor wrote:
When you see a problem like this, make a table

forgive the crappy image, Im super new to this kind of stuff, the top table is supposed to be on the bottom
but we see here, if you just put the numbers where they belong, and place x anywhere on the table really, youll see that the
number of birds that are neither migratory or songbirds is 17+x, which means the minimum value is 17


Thank you so much :)
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Re: Of 60 birds found in a certain location, 20 are songbirds an [#permalink]
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Re: Of 60 birds found in a certain location, 20 are songbirds an [#permalink]
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