Question 29 It takes 1.5 litres of sugar soap to wash a square metre of ceiling and 0.5 litres of sugar soap to wash a square metre of wall. Bianca’s room is 4 metres high and each wall is 5 metres wide. There is one window, which is 4m2 and a door, which is 9m2.
How much sugar soap will Bianca need, assuming she does not wash the door or window (a room has four walls and a roof)?