Final answer:
To find out how many of the 640 students eat school lunches every day, multiply two-fifths by the total number of students, resulting in 256 students eating school lunches daily.
Step-by-step explanation:
The student's question is about calculating what fraction of the school's student population eats lunch provided by the school each day. Given that the school has 640 students in total and two-fifths of these students partake in the school lunch, the calculation needed is a simple multiplication. To find out how many students eat school lunches every day, one would multiply two-fifths (which is the same as 2/5) by the total number of students, which is 640. This can be represented mathematically as:
(2/5) × 640 = 256
Therefore, 256 students eat school lunches every day.