The first team has 28 people and the second team has 20 people. The number of people transferred from the first team to the second team will equal the number of the two teams.
第一队有28人，第二队有20人，从第一队调多少人到第二队，两队人数就相等．
<gadget id="calculator">28 + 20</gadget>
<output>48</output>

<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">28 - 24</gadget>
<output>4</output>

<result>4</result>