If the sum of the digits in a number is divisible by 3, then the original number is divisible by 3.
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All of the above
Move the decimal place two spots to the left.
Move the decimal point one place to the right.
The rule used in this input-output relationship appears to be dividing the input numbers by 3 to get the corresponding output numbers. This can be deduced by observing that 3 divided by 3 is 1, 15 divided by 3 is 5, 18 divided by 3 is 6, and 27 divided by 3 is 9. Therefore, the rule is to divide the input numbers by 3 to obtain the output numbers.
In all of these cases the result is positive.