15 works too.
L= 5.186
W+ 2.314
Nice catch! I’m thinking however that the assignment taken context is helping her learn to find and use whole number factors.
I disagree with those who are ripping the teacher or school system here. But I can see her answering 14 and then provide the logic for 15. Then demand an extra credit point.
Would if L X W = 12 sq. units, but alas, it doesn’t in regular math; however, I haven’t the time or patience to try it in “new math” or “common core math” which might or might not meet their exacting “feels like” standards.