Question 824153
Surface Area of a room:
{{{2(12*8)+2(10*8)+12*10}}} ignoring the door and window.
Accounting for the door and window, room area needing paint is {{{(12*8)+2(10*8)+12*10-(4*5+3*7)}}} square feet.


A specific answer requires knowing the number of these rooms.  Let r = how many rooms like this need painting.


Surface area to paint for the r rooms is {{{r((12*8)+2(10*8)+12*10-(4*5+3*7))}}}


How many gallons of paint needed, {{{highlight((1/250)r((12*8)+2(10*8)+12*10-(4*5+3*7)))}}}