I am assuming the 32 cases contain the small cans...
32 cases...with 28 small cans of fruit in each case..
32 * 28 = 896 small cans of fruit in total
24 cases...with 13 large cans of fruit in each case...
24 * 13 = 312 large cans of fruit in total
so there are (896 - 312) = 584 more small cans then large cans <==