There are 48 students in the first (third) class of the junior high school. The teacher conducted a survey on the only child and found that: 38 of the 48 students have no younger brothers, 8 have younger brothers and no younger sisters, and the number of no younger brothers and younger sisters is the number of younger brothers and younger sisters. 3 times. Just ask: How many of these 48 people are only children?
初一(三)班共有48名学生，老师进行独生子女的调查发现：48人中无弟弟的有38人，有弟弟无妹妹的有8人，无弟弟有妹妹的人数是有弟弟有妹妹人数的3倍．试问：这48人当中是独生子女的有多少人．
<gadget id="calculator">38 + 8</gadget>
<output>46</output>

<gadget id="calculator">48 - 46</gadget>
<output>2</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">38 - 6</gadget>
<output>32</output>

<result>32</result>