There are 30 boys in Class 3, Grade 4, which happens to account for 2/3 of the whole class. How many students are there in this class? How many
四年级3班男生有30人，正好占全班的(2/3)．这个班共有学生多少人？多少
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 / (2/3)</gadget>
<output>45</output>

<result>45</result>