Question 519455
square side = s

rectangle length = s+6
rectangle width =s-3

Perimeter of square = 4s
Twice the perimeter = 8s
perimeter of rectangle = 2*(s+6+s-3)=>2*(2s+3)
=4s+6

4s+6 = 8s-42

4s-8s=-42-6
-4s=-48
/-4
s=12cm  side of square
...
length of rectangle = s+6=>18cm
width of rectangle = s-3=>9cm

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