Given :
A horticulturist is planting a garden that is 4 m x 20 m.
To Find :
Dimensions could she use to create a scale model to plan it.
Solution :
Ratio of dimensions is :
Now , options with same ratio will be useful to make scale diagram :
a) 4/1 = 4
b) 200/40 = 5
c) 5/1 = 5
d) 4/2 = 2
Therefore, options b) and c) are useful to make scale diagram.
Hence, this is the required solution.