Shea drew the rectangle reduction. what is the perimeter, in millimeters, of the reduced rectangle?

We know that
 the dimensions of the original rectangle are
18.6 mm x 31 mm

 the dimensions of the reduced rectangle are 
3 mm x ? mm

step 1
 find the scale factor
scale factor=3/18.6> 1/6.2
then 
the other dimension of the reduced rectangle is 
31*(1/6.2)> 5 mm

perimeter of the reduced rectangle=2*[3+5]> 16 mm

the answer is
The perimeter of the reduced rectangle is 16 mm

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