Venn Diagrams

The following Venn diagram indicates

If $\mathrm{A}\subset \mathrm{B}, n( \mathrm{A})=4$ and $n\left(B\right)=6,$ then $n(A\cup B)=$

In the Venn diagram,

$4\notin$_____

In the Venn diagram $7\in$_____.

A bookstore sells books, magazine and newspapers. Their sales records, indicate that $40\%$ of the customers buy books, $45\%$ buy magazines, $30\%$ buy newspapers, $22\%$ buys books and magazine, $18\%$ buys magazines and newspapers, $14\%$ buy books and newspaper, and $8\%$ buy all three. Illustrate this information on a Venn diagram. What percentage of customers buy books but not magazines?

A bookstore sells books, magazine and newspapers. Their sales records, indicate that $40\%$ of the customers buy books, $45\%$ buy magazines, $30\%$ buy newspapers, $22\%$ buys books and magazine, $18\%$ buys magazines and newspapers, $14\%$ buy books and newspaper, and $8\%$ buy all three. Illustrate this information on a Venn diagram. What percentage of customers buy books only?

In a teen-group survey, it was revealed that $25\%$ of the total students read fiction; $8\%$ read non-fiction; $15\%$ read only text books; $2\%$ read all three; $3\%$ read fiction and non-fiction; $2\%$ read only text books and fiction; $5\%$ read text books and non-fiction; and the rest do not read at all. Draw a Venn diagram depicting this information.

If the Universal set $U=\left\{0, 1, 2, 3, 4, 5, 6, 7, 8, 9\right\}$, then illustrate the following sets on Venn diagrams 

$A=\left\{0, 1, 3, 7\right\} \mathrm{and} B=\left\{0,1, 2, 4, 6, 7, 9\right\}$

If the Universal set $U=\left\{0, 1, 2, 3, 4, 5, 6, 7, 8, 9\right\}$, then illustrate the following sets on Venn diagram. 

$A=\left\{3, 4, 5, 6, 7, 8\right\} \mathrm{and} B=\left\{3, 6, 7\right\}$

In a class of $40$students, $24$like black colour and $18$like white colour while $5$ like neither. Find the number of students who like both black and white colours. Draw a Venn diagram to represent it.

 If $\mathrm{U}=\left\{\mathrm{x}|\mathrm{x}\le 18, \mathrm{x} \mathrm{is} \mathrm{a} \mathrm{positive} \mathrm{number}\right\}$, $\mathrm{R}=\left\{\mathrm{prime} \mathrm{number} \mathrm{less} \mathrm{than} 18\right\}$ and $\mathrm{S}=\left\{\mathrm{composite} \mathrm{number} \mathrm{less} \mathrm{than} 18\right\}$, then represent $\mathrm{R}$ and $\mathrm{S}$ on a Venn diagram.