There are 30 people in the mathematics interest group, which is 1/5 more than the English interest group. How many people are there in the English interest group?
数学兴趣小组有30人，比英语兴趣小组多(1/5)，英语兴趣小组有多少人．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 / (6/5)</gadget>
<output>25</output>

<result>25</result>