It takes 15 minutes to cook a pot of rice, 4 minutes to wash vegetables, 6 minutes to cook vegetables, 5 minutes to tidy up schoolbags, and 8 minutes to eat. How to arrange these things reasonably, at least a few minutes?
煮熟一煲饭要15分钟，洗菜要4分钟，炒菜要6分钟，整理书包要5分钟，吃饭要8分钟，怎样安排这些事情比较合理，最少需几分钟？
<gadget id="calculator">15 + 8</gadget>
<output>23</output>

<result>23</result>