Answer:
9
Explanation:
if 9/3 = 9
then 27/3 = 9
135/15=9
90/10 = 9
36/4 = 9
since all is equal to 9
a=9
Hope this helps
The question is a bit ambiguous. I believe that you are not adding 6 to 3 to get nine.
The only other choice would be 3*3 = 9
So a should 9 * 3 = 27
15 multiplied by 3 = 45
90 divided by 3 = 30
36 * 3 = 108
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