Before breakfast, my mother has to do a lot of things: boiling water takes 15 minutes, cleaning tables and chairs takes 8 minutes, preparing a thermos bottle takes 1 minute, pouring boiling water takes 2 minutes, buying fried dough sticks takes 10 minutes, and boiling milk takes 7 minutes. If there is only one fire on the stove, what is the minimum time required to complete all these tasks? How to arrange?
早饭前妈妈要干好多的事：烧开水要15分钟，擦桌椅要8分钟，准备暖瓶要1分钟，灌开水要2分钟，买油条要10分钟，煮牛奶要7分钟．如果灶具上只有一个火，那么全部做完这些工作最少需要多少时间？怎样安排？
<gadget id="calculator">15 + 7</gadget>
<output>22</output>

<result>22</result>