Answer:
0.875
Explanations:
Scale factors are ratios between the corresponding measurement of an object. From the given question, we are given the following parameters
Diameter of the largest bowl (B₁) = 32cm
Diameter of the second-largest bowl (B₂) = 28cm
Calculate the scale factor "k"

Substitute the given parameters to have:

Hence the scale factor relating the two largest bowls is 0.875