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It is not possible to answer the question because the shape of the figure is unknown.
Divide
Four times the unknown number. Let's say the unknown number is x. x + 3x = 4x
Because, x is a variable, so it can mean any number ever known. It is called the "Unknown Quantity" simply because it represents the number that is not known in the equation. For exampe x+1=y So x and y are variables, each represents a number, if y=2 then it wold be x+1=2 and then you can figure out the "Unknown Quantity" which is 1.
If a perimeter of 8 is obtained by adding 5 and unknown number, then the unknown number is 3.2.