The school science and technology group has 20 people, the dance group is 20% of the technology group, and 30% of the track and field group. How many people are there in the track and field team?
学校科技组有20人，舞蹈组人数是科技组的20%，又是田径组的30%．田径组有多少人？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/5) / (2/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<result>10</result>