A.

B.

Megan's solution isn't correct.
The first mistake: she subtracted 5x from the right-hand side of the equation, but added 5x to the left-hand side.
The second mistake: she divided the right-hand side of the equation by 11, but didn't divide the left-hand side.
The correct solution:
Answer:
53
Step-by-step explanation:
37+90=127
180-127=53
Answer:
The dimensions of the border are 7 yd by 6.25 yd.