Quite likely becouse order of operations is irrelevant for multiplication (m*n=n*m) and for addition (m+n=n+m). IOW, solutions (3,5) and (5,3) are equally valid. If the position of polygons in boxes were of any importance, in the set of offered answers he/she would offer two boxes with changed positions of same polygons, wouldn't he/she?. Well, there is no such pair of boxes among offered answers A,B,C,D,E...
As concerns Q3, I'm totally clueless about it. Maybe it is a very tricky or very stupid one, or maybe it lost colors as you said...