Step-by-step explanation:
hi im not really sure if this is right
6/10
300/500
30/50
60/100
12/20
First you had to rewrite the problem with eighteen as the three times six is equal to eighteen.

Then you factor it out by the common term of six.

Final answer: 
Hope this helps!
And thank you for posting your question at here on brainly, and have a great day.
-Charlie