The number of boys in Class 3 is twice the number of girls. There are 16 girls in class 31. How many students are there in this class?
三1班男生人数是女生人数的2倍．三1班有女生16人，这个班一共有学生有多少人？
<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<gadget id="calculator">32 + 16</gadget>
<output>48</output>

<result>48</result>