There are 15 boys in the sixth grade, which is 3/8 of the whole class. How many are there in the sixth grade?
六年级男生有15人，是全班人数的(3/8)，六年级一共有多少人．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">15 / (3/8)</gadget>
<output>40</output>

<result>40</result>