Question 870691
The total surface area of the room is
{{{SA=2p*r+2q*r=2r(p+q)}}}
Each window is {{{A[win]=c*d}}}
The door is {{{A[door]=x*y}}}
So the total amount of paper is,
{{{A[paper]=2r(p+q)-2*c*d-x*y}}}