Answer :
10.5 per boxed article, multiply by 20 for 20 boxed articles then add 15 which is=
(10.5*20)+15= 225
or
(10.5*20)+15= 225
or
In this question, a package of 10lb was put on a box with 0.5 lb weight. That mean every box would weight : 10lb + 0.5 lb= 10.5lb per box.
Then 20 of those boxes is put on a freight container with 15lb weight. Then the total weight should be:
20 boxes * 10.5 lb/box +15 lb= 210lb + 15 lb= 225lb
Then 20 of those boxes is put on a freight container with 15lb weight. Then the total weight should be:
20 boxes * 10.5 lb/box +15 lb= 210lb + 15 lb= 225lb