On average, if the surface to be painted is properly prepared, and all else is optimal, the imperial gallon will cover approximately 400 square feet.
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It will take about 8 gallons of drywall primer and 8 gallons of paint.
7.7 gallons.
I work for Sherwin Williams paints and from what I understand it is our paints that paint The White House. The paint is a special mix. Everyone who comes in contact with the paint has to go through a background check.
If 169 is floor area, then you are talking about roughly 430 square feet of wall. I would paint that with a bit less than 2 gallons.
Covers 25 sq ft per gallon according to mfgr, so about 7.5 gallons.