the are asking what do you multiply 27 by to get 9? 27 * x = 9 where x is the unknown number if you divide both sides by 27 you get x= 9/27 you can simplify that fraction to get the answer.
or what do you multiply 9 by to get 3? or what do you multiply 3 by to get 1 ?
are you saying 27*3 = 9 ?
common ratio of a geometric series r, the ratio of (n+1)/n term
every term divided by the previous term should give you the same number as the common ratio
9 / 27 3 / 9 1/3 .....
all successive have common ratio r = 1/3
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