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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.

62  have blue ribbons, 55 have green ribbons, and 63 have white ribbons.

32  have a blue ribbon and a green ribbon; 31 have a green ribbon and a white ribbon; 38 have a blue ribbon and a white ribbon.

16  have all three ribbons.

How many dogs have not learned any tricks?

 Jun 9, 2020
 #1
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Hint: You can use a Venn diagram.

 Jun 10, 2020
 #2
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I know but give answer or bigger hint

Guest Jun 10, 2020

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