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.
If the ratio of Spanish classes to French classes is 3:1, then there are 3/4*850=<<3/4*850=637.5>>637.5 students who can choose Spanish. Rounding to the nearest whole number, 637 students can choose Spanish. Answer: \boxed{637}.
