Question 1152040
The surface area is
2 walls 18 x 9=162*2=324
2 walls 17 x 9=153*2=306
ceiling 17 x 18=306*1=306
That is 936 ft^2
subtract window or 4* 3 3/4=15
This is 921 ft^2
Two coats means the equivalent surface area as if the room were twice that or 1842 ft^2.
That is as far as one can go with the information.