On Sunday, students from Class 5 and 2 went to the nursing home to visit the elderly. The time spent by the students on the road accounts for (1/5) of the total activity time, (3/10) the time spent helping the elderly tidy up the room, (1/4) the time spent listening to the elderly telling stories, and the rest is for the elderly The time for their performances. Please ask questions and calculate.
星期天，五2班的同学去敬老院慰问老人．同学们路上用去的时间占全部活动时间的(1/5)，帮助老人们整理房间的时间占(3/10)，听老人讲故事的时间占(1/4)，其余的是为老人们表演节目的时间．请你提出问题并计算．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/5) - (3/10) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>