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In a class of 29 children, each of 20 children has a dog and each of 15 has a cat. How many of the children have both a dog and a cat?

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Ajguasinviz
In a class with 29 children 20 of them has a dog and 15 has a cat. so this means

20+15=35, then 35-29=6 so there are 6 children with cats and dogs. 
6 children have both cats and dogs....