There are 22 boys, 21 girls, and 16 people participated in the relay race. How many people didn't go?
男生有22人，女生有21人，有16人参加接力赛，有多少人没有去？
<gadget id="calculator">21 - 16</gadget>
<output>5</output>

<gadget id="calculator">22 + 5</gadget>
<output>27</output>

<result>27</result>