Answer :
Ok so one gallon is 400 and you want to cover 688 x 2
688 x 2 is 1376. Now you divide 1376 by 400.
You now know that to paint the walls with two coats of paint will cost you four cans of paint.
688 x 2 is 1376. Now you divide 1376 by 400.
You now know that to paint the walls with two coats of paint will cost you four cans of paint.