There are 32 people skipping rope, 11 people left, and 19 people came again, how many people are there now?
有32人在跳绳，走了11人，又来了19人，现在有多少人？
<gadget id="calculator">32 - 11</gadget>
<output>21</output>

<gadget id="calculator">21 + 19</gadget>
<output>40</output>

<result>40</result>