How many users, between the age 27 to 35, were surveyed in 2018?
Age 27 to 35 refer to AnswerText 27 BETWEEN 35 where questionid = 1; 2018 refer to SurveyID


SELECT T1.UserID FROM Answer AS T1 INNER JOIN Question AS T2 ON T1.QuestionID = T2.questionid WHERE T1.SurveyID = 2018 AND T2.questionid = 1 AND T1.AnswerText BETWEEN '27' AND '35'