To turtn this question into a percent, we first need to reduce the fraction.
To reduce a fraction, you need to find a number that the numerator and the denominator can both divide into.
18 can be divided by 2.
126 can be divided by 2.
These numbers are both able to be divided 2.
So, now once I do 18/2 and 126/2, the fraction changes into:

Now that the fraction is
, it can no longer be reduced, we turn it into a fraction.
9/63 = 0.142857
Or 14%.
So your answer is 14 percent, rounded.