S=a+b+c/2 solve for c

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?

Adriveway is 40 yards long about how many meters long is it

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'