Real answers only plz help!

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

On a architect's drawing of a house, 1 inche representa 1.5

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much