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Brent, Corrigan and Bieber went out to birdwatching. Each one saw a bird that no one else did. Each pair between them saw a bird that the third didn't. Finally, one bird was seen by everyone. From the birds Brent saw, 2 were yellow. From the birds Corrigan saw, 3 were yellow. From the birds Bieber saw, 4 were yellow.

How many yellow birds were seen altogether?
How many birds with other colors were seen altogether?

 Nov 7, 2014

Best Answer 

 #9
avatar+98173 
+13

Here's my answer

All saw yellow bird 5

Bierber saw 4 yellow birds, yellow bird 4 was seen by him only, yellow bird 2 was seen by him and Brent and not seen by Corrigan, yellow bird 3 was seen by him and Corrigan and not seen by Brent

Corrigan saw 3 yellow birds and one non-yelllow bird. He and Bieber see yellow bird 3 that was not seen by Brent. He and Brent see non-yellow bird 2 that is not seen by Bieber.

Brent saw 2 yellow and 2 non-yellow birds. He sees non-yellow bird 1 that is not seen by the others.

5 yellow birds were seen....2 non-yellow birds were seen.

 

 Nov 7, 2014
 #1
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5 yellow birds.  2 other colored

 Nov 7, 2014
 #2
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you were wrong

 Nov 7, 2014
 #3
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How?  Each saw 1 bird the other didn't.  3 birds witnesses.  Each pair saw a bird the other didn't. 6 more witnesses. They all finally saw one bird.  3 witnesses.  They all saw 4 birds.  What did I do wrong?

 Nov 7, 2014
 #4
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you forgot to add in the yellow birds that were seen by more than one person

 Nov 7, 2014
 #5
avatar+7188 
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Okay.  I see.  Read it wrong. Thanks. I'll edit.

 Nov 7, 2014
 #6
avatar+7188 
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Reread my answer.  Better?

 Nov 7, 2014
 #7
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yes much better now it is correct

 Nov 7, 2014
 #8
avatar+7188 
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Okay.  Glad I could help......

 Nov 7, 2014
 #9
avatar+98173 
+13
Best Answer

Here's my answer

All saw yellow bird 5

Bierber saw 4 yellow birds, yellow bird 4 was seen by him only, yellow bird 2 was seen by him and Brent and not seen by Corrigan, yellow bird 3 was seen by him and Corrigan and not seen by Brent

Corrigan saw 3 yellow birds and one non-yelllow bird. He and Bieber see yellow bird 3 that was not seen by Brent. He and Brent see non-yellow bird 2 that is not seen by Bieber.

Brent saw 2 yellow and 2 non-yellow birds. He sees non-yellow bird 1 that is not seen by the others.

5 yellow birds were seen....2 non-yellow birds were seen.

 

CPhill Nov 7, 2014

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