Question

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)

Answer 1

34.5 meters square.

Explanation:

Walls: 4 x 5 meters

• 20 meters squared

Roof: 5 x 5 meters

• 25 meters squared

20 x 0.5 = 10

25 x 1.5 = 37.5

10 + 37.5 = 47.5

There is a window and a door she doesn't need to wash that takes up some of that space. The window takes up 4 square meters and the door takes up 9 square meters. So, there is 13 square meters she will not wash (4+9=13).

We subtract what she won't wash from our original number of 47.5.

47.5 - 13 = 34.5