Answer:
Marcia will need 40 inches of wood for the frame
Explanation:
The question in English is
Marcia will make a frame for her painting. The length of the frame is 15 inches, the width is a third of the length. How much wood does Marcia need for the frame?
we know that
The perimeter of a rectangle is given by the formula

where
L is the length
W is the width
we have

the width is a third of the length
so

substitute the value of L

Find the perimeter
