Q30:
A rectangular photograph is surrounded by a border that is 1 inch wide on each side. The total area of the photograph and the border is M square inches. If the border had been 2 inches wide on each side, the total area would have been (M + 52) square inches. What is the perimeter of the photograph, in inches? A. 34 B. 36 C. 38 D. 40 E. 42 I can only until xy=M (x+1)(y+1)=M+52 (x+1)(y+1)-xy=52 (x+2)y-xy=52 and solve x=25, y=26. But can't find the perimeter=40, which is D. Can anyone please help? Thank you very much. | 
