The sixth grade students actively participate in interest group activities. There are 30 students in the language group, accounting for 1/5 of the sixth grade students, and 3/10 in the mathematics group. How many people participate in the mathematics group?
六年级学生积极参加兴趣小组活动，参加语文组的有30人，占六年级学生人数(1/5)，参加数学组的人数占六年级人数(3/10)，参加数学组有多少人？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 / (1/5)</gadget>
<output>150</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">150 * (3/10)</gadget>
<output>45</output>

<result>45</result>