There are 12 more boys in Class 1 than the whole class (2/5), and girls account for 1/2 of the boys. How many students are there in the class?
六1班男生比全班人数的(2/5)多12人，女生人数占男生的(1/2)，全班有学生多少人？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">12 / (4/15)</gadget>
<output>45</output>

<result>45</result>