Question 365593
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Hi, 
*Note;  Key to these is assigning a variable.
Let x represent the height, then the width would be (x -12)
x + x + (x -12) + (x -12) = 200ft
x = 56ft, is the height and the width 44ft  (56-12)
checking our answer
2*56ft + 2* 44ft = 200ft
112ft + 88ft = 200 ft

Second Set up is:
Let x represent the width, then the length would be 7x
Let You take it from there.