On Monday Elisa paints 30 square feet of wall.
She paints 2 x 30 square feet on Tuesday = <<2*30=60>>60 square feet of wall.
On Wednesday Elisa paints 1/2 as many square feet as she painted on Monday, 1/2 x 30 square feet = <<1/2*30=15>>15 square feet of wall.
In total, Elisa paints 30 + 60 + 15 = <<30+60+15=105>>105 square feet of wall.
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