Jackson's grandmother is moving to a new house. grandmother has eighty-seven boxes for jackson to put in the truck. jackson puts thirty-one boxes in the truck before breakfast. jackson puts thirty-six boxes in the truck before lunch. jackson puts fourteen boxes in the truck before dinner. grandmother counts all the boxes left and tells jackson that he will be happy about how many boxes he has to put in the truck in the truck after dinner. how many boxes are left for jackson to put in the truck after dinner?