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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?

 Feb 25, 2022
 #1
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There are 9 dogs who did not learn any tricks.

 Feb 25, 2022
 #2
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Here, 

 

I have started it for you.

Always do the biggest overlap first and work out from there

 

 Feb 25, 2022

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