49. It's winter vacation, and in the first week, Xi Xi completed $\frac{1}{5}$ of all the questions in the *Winter Vacation Homework*. In the second week, she completed 30% of all the questions, which was 15 more questions than in the first week. Therefore, the total number of questions in Xi Xi's *Winter Vacation Homework* is $\qquad$ questions.
Reference answer: 150