The dimension of the document is 35 inches by 40 inches. It is redrawn at a scale of 1 1/2 or 3/2 or 1.5 The dimension will be: 35 * 1.5 = 52.5 in 40 * 1.5 = 60 in
Then redrawn again at 1/4 or 0.25 52.5 * 0.25 = 13.125 in 60 * 0.25 = 15 in
So the final dimensions of the drawing is 13.125 in by 15 in
AC= 43 in the problem it says that point b is 12 stories above point C Which means that if you subtract 43-12 that may be the answer so AB= 31 but thats only my guess you could try the answer but I'm sorry if its wrong ;-;