There are four walls in room .the 12 foots wall in your room have no doors or windows. of the two 11 ft walls one has a door measuring 2.5ft by 6.5ft and other has two windows both measuring 3ft by 4ft .the ceilingsin your room are are 8.5ft high .
Calculate the area of 4 walls that will be painted
total area is 2(12+11)*8.5
door area is 2.5 * 6.5
window area is 2*3*4
so now finish it off