The Room of Requirement is located on Hogwarts' seventh floor, across from the tapestry of Barnabas the Barmy. To "open it" you must walk past the area of the door three times, thinking of what you need. For example: Say you need a place to study.
Answer:
1+1=2.when add 1 to 1 you get 2
Explanation:
because 1+1=2
The answer to your question would be A. Planes.
