A certain primary school held the second classroom activity. There were 30 people in the art group, which was 1/4 more than the model group. How many people were there in the model group? (First write out the equivalent relationship, and then list the equation solution)
某小学开展第二课堂活动，美术小组有30人，比航模小组的人数多(1/4)，航模小组有多少人？(先写出等量关系，再列方程解答)
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">30 / (5/4)</gadget>
<output>24</output>

<result>24</result>