Answer :
article (10 lbs) + box (1/2 lb) = 10.5 lbs
20 boxes = 20*10.5 = 210 lbs
210 lbs + 15 (freight container) = 225 lbs <==
20 boxes = 20*10.5 = 210 lbs
210 lbs + 15 (freight container) = 225 lbs <==