28
Explanation:
Given,
No. of cameras that Gretta has : 103
No. of Cameras she misplaced : 75
1 full box contains 1 camera each
No. of full boxes that she can ship:
= No. of Cameras she has - no. of cameras she misplaced.
= 103-75
= 28
Therefore, the no. of full boxes that Gretta can ship is 28.