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There are 30 people in my math class. 12 of them have cool dads, 18 of them have cool moms, and 9 of them have cool dads and cool moms. How many people have moms and dads who are both uncool?

 Jul 6, 2022
 #1
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12 - 9 = cool dads only  =  3

18 - 9 = cool moms only  = 9

 

30 - ( 3 + 9 + 9)  = 

 

30  -  21  =

 

9   have both uncool

 

cool cool cool

 Jul 6, 2022

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