A survey on 30 fifth grade pupils asked them to name the kind of pets they have at home. The Venn diagram below represents the results of the survey. The results showed that among the 30 fifth grade pupils, 19 have dogs (D), 13 of them have cats (C), and 10 have birds (B). Four pupils both have dogs and cats. Five have dogs only. All pupils who have birds also have dogs while there were 5 pupils who do nothave any of these pets