Mandy works construction. She knows that a 5 meter long metal bar has a mass of 40 kg. Mandy wants to figure out the mass (w) of a bar made out of the same metal that is just 3 meters long and the same thickness. Which proportion could Mandy use to model out this situation?A: 40/3=w/5B:5/3=40/wSolve the proportion to determine the mass of the shorter bar.