the answer is the first one
Answer:
6 
Step-by-step explanation:
OK because 9 is less than 13 we have to add to nine using the whole number.
9 turns into 8 and 9 turns into 24. (15 makes a whole so we must add 15 to 9)
now we can subtract.
8
- 2
= 6 
Hope I helped you. You didn't even asked any question.
Just do a proportion to set up your problem so you would have (1/2)=(8/x) then solve for x. which you would get 16