Boil water for 20 minutes, wash vegetables for 10 minutes, and pour water for 1 minute. How many minutes will it take to finish these chores?
烧水20分钟、洗菜10分钟、倒水1分钟，做完这些家务最少要用多少分钟．
<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>