First, Amanda needs to figure out how many walls there are in the house, 5 rooms x 4 walls each = <<5*4=20>>20 walls.
The other 4 rooms have x 5 walls each = 20 walls.
The house has 20 walls + 20 walls = <<20+20=40>>40 walls total.
To divide the work equally between the 5 people, 40 walls / 5 people = <<40/5=8>>8 walls for each person.
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