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 6 inches wide on each side, the total area would have been (M + 200) square inches. What is the perimeter of the photograph, in inches? Choose the correct option.
A) 8	B) 12	C) 16	D) 20	E) 24
Let x and y be the width and length of the photograph.   (x+2)(y+2)=M and so (1) xy + 2x + 2y + 4 = M   (x+12)(y+12)=M and so (2) xy + 12x + 12y + 144 = M+200   Let's subtract equation (1) from equation (2).   10x + 10y + 140 = 200   2x + 2y = 12, which is the perimeter of the photograph.   The answer is 12.
<result>B</result>
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 6 inches wide on each side, the total area would have been (M + 200) square inches. What is the perimeter of the photograph, in inches?