SOLUTION: In a certain dormitory, there are 72 rooms for 131 students. If each room is occupied by either one or two students, how many rooms are occupied by just one student?

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Question 203612: In a certain dormitory, there are 72 rooms for 131 students. If each room is occupied by either one or two students, how many rooms are occupied by just one student?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let s="number of single rooms" and d="number of of double rooms"

"there are 72 rooms" ___ s + d = 72

"for 131 students" ___ s + 2d = 131

subtracting equations ___ d = 59

substituting ___ s + 59 = 72 ___ s = 13