Xiaohong helps her mother with housework at home. It takes 10 minutes to sweep the floor, 15 minutes to boil water, 1 minute to pour water, and 3 minutes to wash vegetables. How many minutes does it take him to finish these housework at least?
小红在家帮妈妈做家务活，扫地用10分钟，烧水用15分钟，倒水用l分钟，洗菜用3分钟，他做完这些家务活至少用多少分钟
<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>