Book Maths Puzzle Ratio and Proportion

I can't figure this proportion out

6/19n= -2/nn=2

The nn is actually n squared

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Book Other Question

the sides of his rectangled yard is 12'x9'. the pool is trisected in the rectangle. what is the perimeter of the pool? the sides of his rectangled yard is 12'x9'. the pool is trisected in the rectangle. what is the perimeter of the pool? in the picture the pool is shaded
in . its like the 4 corn