There are 121 boys and 83 girls in the first grade of Guangming Primary School, 150 of them have had their health checks, and how many of them haven't had their health checks?
光明小学一年级有男生121人，女生83人，已经检查身体的有150人，没检查身体的有多少人？
<gadget id="calculator">83 - 150</gadget>
<output>-67</output>

<gadget id="calculator">121 + (-67)</gadget>
<output>54</output>

<result>54</result>