In the figure above, this is a rectangle and the lengths of the sides are x-3 and x+3 respectively. If the perimeter of the rectangle above is 72, what is the value of x?
Choices:
A.9
B.15
C.18
D.21
E.36
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: In the figure above, this is a rectangle and the lengths of the sides are x-3 and x+3 respectively. If the perimeter of the rectangle above is 72, what is the value of x?
Choices:
A.9
B.15
C.18
D.21
E.36
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: In the figure above, this is a rectangle and the lengths of the sides are x-3 and x+3 respectively. If the perimeter of the rectangle above is 72, what is the value of x?
Choices:
A.9
B.15
C.18
D.21
E.36