Xiaohua will help his mother do the following things on Sunday. It takes 10 minutes to sweep the floor, 15 minutes to wipe the furniture, 40 minutes to wash the clothes in the washing machine, and 5 minutes to dry the clothes. After reasonable arrangements, he can finish these things at least How many minutes will it take.
小华周日要帮妈妈做以下事情，扫地要用10分钟，擦家具要用15分钟，用洗衣机洗衣服要用40分钟，晾衣服要用5分钟，他经过合理安排，做完这些事情至少要用多少分钟．
<gadget id="calculator">40 + 5</gadget>
<output>45</output>

<result>45</result>