Answer:
48
Explanation:
So, there is extra information given here, like the living room dimensions.
We know that the dimensions for the bedroom is 3cm by 9cm.
The scale factor is that for every 3 cm, the actual dimension is 4 m.
There is "1" 3 in "3cm", so that's 4 m.
There are "3" 3s in "9cm" so that would be 12 m.
4x12
=48
So the area of the actual bedroom is 48m^2.
Hope this helps! :)