Xiaobao boiled water and made tea for the guests. It takes 3 minutes to brew tea, 10 minutes to boil water, 2 minutes to wash the teapot, 5 minutes to wash the cups, and 1 minute to hold the tea leaves. Xiaobao estimated that it would take up to 21 minutes to complete all the tasks. In order to make the guests drink tea earlier, how to arrange and how many minutes to make the tea?
小宝为客人烧水沏茶．沏茶要3分钟，烧开水要用10分钟，洗茶壶要用2分钟，洗茶杯要用5分钟，拿茶叶要用1分钟．小宝估算了一下全部完成下来最长要用21钟．为了使客人早点喝上茶，怎样安排，多少分钟能沏好茶？
<gadget id="calculator">10 + 3</gadget>
<output>13</output>

<result>13</result>