The number of restrooms needed for 640 students is 640 students / 80 students/restroom = 8 restrooms.
The new school building must have 8 restrooms x 2 restrooms/student = <<8*2=16>>16 restrooms. Answer: \boxed{16}.
A new school will have 640 students. A construction code requires that new buildings have 2 restrooms for every 80 students in the building. Based on the construction code, what is the total number of restrooms the new school building must have?
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