Question 669700
s + n = 670
2.5s + 5n = 2225
...
substitute
2.5s + 5(670-s) = 2225
2.5s + 3350 - 5s = 2225
-2.5s = 2225 - 3350
-2.5s = -1125
s = {{{highlight_green(450)}}} students
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