Answer:
Scale : 1 mm =
Or
Scale : 3 mm = 1 m
Explanation:
Let the scale used be 1 mm = 'x' m
Given:
Actual width of kitchen is 12 m.
Length used by Kate in drawing is 36 mm.
So, 36 mm in drawing is equivalent to 12 m in actual.
Therefore, 1 mm in drawing is equivalent to 'x' m in actual.
Taking proportions and solving by cross multiplication, we get

Therefore, 1 mm in drawing is equal to
in actual.
Scale : 1 mm =
Or
Scale : 3 mm = 1 m