Respuesta :
Answer: The answer is 8 students.
Step-by-step explanation: Given that there is a bus full of students in which the total number of students is 20.
Also, it is given that two-fifth of the students pack their lunches.
So, the number of students who pack their lunches is given by
[tex]n=\dfrac{2}{5}~\textup{of the total number of students}=\dfrac{2}{5}\times 20=2\times 4=8.[/tex]
Thus, the number of students who pack their lunches is 8.