We can make 5 such rectangles
use your intuition and draw a diagram that shows all the different possiblities
If the ratio between the sides is
, the ratio between the areas will be
and the ratio between the volumes will be 
<span>T(x,y) -> (x-3, y+7)
</span><span>is usually i have seen them parametrically defined
</span>
209÷47= 4.45, but you cant mos part of a lawn, so he needs to mow 5 lawns