The number of students in a certain class is between 45 and 50. If there are three and three numbers, there will be one more student; four four and four students will also have one more student. How many students are there in this class?
某班学生人数在45至50之间，三个三个数，多1人；四个四个数，也多1人．这个班有多少名学生？
<gadget id="calculator">48 + 1</gadget>
<output>49</output>

<result>49</result>