Alexandra packs boxes of envelopes into a large box the volume of each box of envelopes is 1200 cubic centimeters which is the best estimate for the volume of the large box (ps:u gotta count the boxes
you would do 5 x 4 then it will give you 20. after that you will multiply 20 x 1200 and it would give you 24000. (p.s when you multiply 5 x 4 you are finding the # of the boxes