28 lb. 6 oz. - 11 lb. 5 oz. =

17lbs. and 1oz.

Step-by-step explanation:

First I would separate the oz. and the lbs. and subtract them separately.

28lbs. - 11lbs., and 6oz. - 5oz.

then I would subtract;

28lbs. - 11lbs. = 17lbs.

6oz. - 5oz. = 1oz.

So your 2 answers would be 17lbs. and 1oz.

17.0625 thats the answer