On Sunday, Yang Hong helps her mother with housework: 20 points for washing clothes, 8 points for sweeping the floor, 13 points for wiping furniture, and 3 points for drying clothes. After reasonable arrangements, she took at least how many minutes to finish these things.
星期日，杨红帮妈妈做家务：洗衣机洗衣服用20分；扫地用8分；擦家具用13分；晾衣服用3分．她经过合理安排，做完这些事情至少用了多少分钟．
<gadget id="calculator">3 - 20</gadget>
<output>-17</output>

<gadget id="calculator">20 + 8 + 13 + (-17)</gadget>
<output>24</output>

<result>24</result>