Question 277305
Given the uniform width of the border is 2.5 inches, then you will need to add 5 inches to the inner rectangle's length and width to determine the outer rectangle's area:
l + 5 = 7 + 5 = 12
w + 5 = 13 + 5 = 18
So, the outer rectangle's area = l*w = 12*18 = 216
.
The inner rectangle's are = 7 * 13 = 91
.
That means the area of the 'border' = 216 - 91 = 125
.
Done