Given:
Cost of ticket for student is $7.
Cost of ticket for non-student is $18.
The total cost of tickets is $6,440.
The number of tickets sold for students is 4 times more than number of tickets sold for non-students.
The objective is to find the total number of tickets sold.
Consider the number of non-students as x. Since the number of tickets sold for students is 4 times more than non students.
So, consider number of students as 4x.
The cost equation can be represented as,
[tex]4x(7)+x(18)=6440[/tex]Now the value of x can be calculated as,
[tex]\begin{gathered} 28x+18x=6440 \\ 46x=6440 \\ x=\frac{6440}{46} \\ x=140 \end{gathered}[/tex]Then, the total number of tickets can be calculated as,
[tex]\begin{gathered} N=4x+x \\ =4(140)+140 \\ =560+140 \\ =700 \end{gathered}[/tex]Hence, the total number of tickets sold is 700.