Solve this:

Perimeter of rectangle=30 unit
2(l+b)=30
l+b=30/2
l+b=15
Since the square is divided into4 rectangles and the side of square are equal.So,length will be 4 times the breadth.
Let b=x
L=4x
l+b=15
4x+x=15
5x=15
x=3
b=3
l=12
So all sides of the square are 12 unit
Perimeter of square=4×12
48 unit

 

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