40375

B) To do question "b" you need to assign the different sides of the smaller rectangles, letters. So the length is "X", the height is "Y" and the area is "Z." This is the information we know. X*Y=Z and X/3=Y. Also we can swap around the formula to 3Y=X. To figure out "Z" you need to do 60/5=12 so Z=12. That means that X*Y=12. We know that X=3Y so we can swap out the "X" for "3Y" so the formula is 3Y*Y=12 or 3Y^2=12. So 12/3=4 and the square root of 4 is 2. So Y=2 and X=12/2=6. So the perimeter is 6+6+2+2=16.