A total of 38 students are competing on 12 table tennis tables. How many table tennis tables are there for singles?
12张乒乓球桌上一共有38名同学在比赛，用来单打的乒乓球桌有多少张．
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">48 - 38</gadget>
<output>10</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>