What is the answer to this question?

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

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?

George writes the mixed number as sum and uses the distributive property 1/2.-2/5=1/2-2+2/5=1/2