There are 21 girls in class 61 of a certain elementary school, which is 7/8 of the number of boys. How many students are there in this class?
某小学六1班有女生21人，是男生人数的(7/8)，这个班有多少名学生？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">21 / (7/8)</gadget>
<output>24</output>

<gadget id="calculator">24 + 21</gadget>
<output>45</output>

<result>45</result>