There are 30 students from Class 1 of Grade 6 of Chaoyang Primary School participated in the calligraphy interest group, which is less than the number of students in Grade 5 (3/5). How many people in Grade 5 participated in the interest group of Calligraphy?
朝阳小学六年级一班有30人参加了书法兴趣小组，比五年级的人数少(3/5)，五年级有多少人参加了书法兴趣小组？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<result>75</result>