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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, 65 have green ribbons, and 50 have white ribbons.
* 35 have a blue ribbon and a green ribbon;  23 have a blue ribbon and a white ribbon; 31 have a green ribbon and a white ribbon.
 * 15 have all three ribbons.

Fill in the Venn diagram.

 Nov 2, 2022
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Since 15 have all three ribbons:

 

35-15 = 20 with a blue and green ribbon only

23-15 = 8 with a blue and white ribbon only

31-15 = 16 with a green and white ribbon only.

 

So then we're gonna find all the dogs who only have one ribbon.

 

62-15-20-8 = 19 with blue only

65-15-20-16 = 14 with green only

50-15-8-16 = 11 with white only

 

(I think)

 Nov 2, 2022

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