Thinking Mathematically (6th Edition)

$22$
To find the number of respondents who disagreed with the statement, the cardinalities outside set A must be added together. The Venn diagram shows the following cardinalities outside Set A: $8, 2, 3, 9$. Thus, the number of respondents who disagreed with the statement is: $=8+2+3+9 \\=22$