Respuesta :

the breadth (width) would be 0.5/20m, this is because 2/5m is equivalent to 8/20, because it is proportional. 8/20 plus 8/20 is 16/20. 17/20 - 16/20 is 1, 1 divided be 2 is 0.5, therefore... 0.5 times 2 is 1, and 1 plus 16 is 17.

hope this helps :)