How many pupils have cats in their house?, 15, 13, 10, 5, How many pupils have dogs in their house?, 18, 10, 15, 13, How many pupils have a pet that is not a cat or a dog?, 9, 10, 4, 6, What is the total number of the pupils who have pets?, 29, 35, 37, 32, How many more pupils have a pet dog than a pet cat?, 3, 4, 6, 9.

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