A disaster rescue team spends (1/8) of its time resting in a day, and the rest of the time is used for disaster relief and rescue work. How many hours are used for disaster relief and rescue work?
一个救灾抢险队一天中用来休息的时间占(1/8)，其余的时间都用来救灾抢险工作，用来救灾抢险工作的时间是多少小时．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">24 * (7/8)</gadget>
<output>21</output>

<result>21</result>