Hey! In order to do this question, we need to understand the content of the information.
Shela plays golf for three hours a day. In order to find out how many days she has played golf in order to get eighteen total hours in we can simply take the total amount of hours she has played and divide it by the amount of hours she plays per day to get the amount of days she has been playing golf.
Which means she has played for 6 days.