What is the ratio comparing 21in and 9in to 66mm and 120mm and write the ratio in simplest form

Question

There are two pairs of circles and I need to comepare both of the the radii of each pair and write it in simplest form 

Answer 1

There are TWO separate ratios here:

 

a) 21/9, which you can reduce

b) 66 to 120, which you can reduce.

 

The English usage of this question is not perfect.