Hello again! So what you have to do ir add up all of the weights to find out how much Duane's backpack weighs in total. Before you do that, convert 2 1/4 to ounces which equals 36 ounces and convert 3 3/4 to ounces which equals 60 ounces. Add them all up and you get 176 ounces. Hope I helped again!
