Problem: The area of a rectangle remains unchanged when it is made 221​ inches longer and 32​ inch narrower, or when it is made 221​ inches shorter and 34​ inch wider. Its area, in square inches, is:
Answer Choices:
A. 30
B. 80/3
C. 24
D. 45/2
E. 20
Solution:
If l and w represent the dimensions of the rectangle, then (l+25​)(w−32​)=(l−25​)(w+34​)=lw ∴l=215​ and w=38​, and the area is 20.