20 children stand in a row to do exercises, and every two adjacent children are 2 meters apart. How long is the exercise team?
20位小朋友站成一排做操，每相邻的两个小朋友相隔2米，做操的队伍长多少米？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">19 * 2</gadget>
<output>38</output>

<result>38</result>