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Dogs in the GoodDog Obedience School win a blue ribbon for learning how to sit, a green ribbon for learning how to roll over, and a white ribbon for learning how to stay. There are 100 dogs in the school. 

73 have blue ribbons, 39 have green ribbons, and 62 have white ribbons. 

21 have a blue ribbon and a green ribbon; 28 have a green ribbon and a white ribbon; 41 have a blue ribbon and a white ribbon. 

14 have all three ribbons. 

How many dogs have not learned any tricks?

Guest Feb 21, 2015

Best Answer 

 #1
avatar+87604 
+9

Here's a Venn diagram showing the numbers in each "cat"egory.....Mmmmm....maybe it should be each "dog"etory, huh??

 

 

CPhill  Feb 21, 2015
 #1
avatar+87604 
+9
Best Answer

Here's a Venn diagram showing the numbers in each "cat"egory.....Mmmmm....maybe it should be each "dog"etory, huh??

 

 

CPhill  Feb 21, 2015

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