There are 30 people in the art group of No. 5 Primary School in Pan District. The number of people in the chess group is both the art group (1/2) and the music group (3/5). How many people are there in the music group? (solution by equation)
潘区五小美术小组有30人，棋类小组人数既是美术小组的(1/2)，又是音乐小组的(3/5)，音乐小组有多少人？(用方程解)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">15 / (3/5)</gadget>
<output>25</output>

<result>25</result>