Who is asking: Student
Draw a diagram. Label the length as L cm and the width as W cm.
The perimeter is the total distance around the frame. There are two sides of length L cm and two sides of length W cm. Hence the perimeter is 2L + 2W. That is
ou also know that "The width of the frame is seven tenths of its length", hence
Solve this equation for L and then use the fact that W = 7/10 L to find W.Cheers,