The answer depends on where the "original" colony is meant to have been!
It is the square of the original number. If the original number represents a length, then the square of the original number represents an area of a square with side equal to the original number.
So, 49 is .35 of the original number. That means 49 is 35/100ths of the original number. Divide 49 by 35- that gets you 1/100th of the original number. Take THAT number, multiply by 100, and you have the original number.
The original number is the only one.
Five
55