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9s - 9
It is only because we count in tens - and 5 10 and 2 are factors.
In a square by definition all sides are equal, and the length of a side may be designated by s. The perimeter, 4s, is apparently stated to be equal to 9s - 15. given these conditions, 4s = 9s - 15; subtracting 4s and adding 15 5o each side results in 15 = 5s or s = 3. However, the language of the problem is ambiguous and could instead be interpreted as 4s = 9(s - 15). If that interpretation is used, 5s = 135, and s would equal 27.
5s-r
5s - 6 = 2s, ie 5s - 2s = 6, ie 3s = 6, ie s = 2