Answer:
I got 1.25
Step-by-step explanation:
20✔️3 + 4✔️27
20✔️3 + 4✔️9 • 3
20✔️3 + 4 • 3 ✔️3
20✔️3 + 12✔️3
32✔️3.
The solution is 32✔️3.
Sometimes; though your question isn't that clear.
I think you have to add 513mm and 712mm to get the perimeter of your rectangle hope this helped