Working word problem

[serenity]

Susie worked a total of 33 hours in one week. She worked half as many overtime hours as she worked regular hours. How many overtime hours did she work?
I interpreted as 33=(1/2)x
therefore x=16
However is incorrect the answer is 11 hours of overtime

 

[Denis]

x = overtime hours; so regular = 2x hours
x + 2x = 33
Finish it.