The incoming 7th grade class has a choice of French or Spanish as a language elective. There are 3 times as many Spanish classes as French classes (or 3 to 1). How many students can choose Spanish if there are 850 students? Round to the nearest whole number.
213 students can take Spanish
283 students can take Spanish
425 students can take Spanish
638 students can take Spanish
If there are 3 times as many Spanish classes as French classes, then there would be 3 classes of French and 3 * 3 = <<3*3=9>>9 classes of Spanish.
If there are 850 students, and we assume there are an equal number of students in each class, then each class would have 850 / (3 + 9) = <<850/(3+9)=70>>70 students.
Therefore, 9 classes of Spanish would have 9 * 70 = <<9*70=630>>630 students. Answer: \boxed{638}.