56 young pioneers participated in school labor, among them (3/7) cleaned the auditorium, (3/8) of the remaining team members cleaned the playground, and the rest (1/4) cleaned the classroom, and the rest were responsible for To clean the open space outside, how many people are there to clean the open space?
56名少先队员参加学校劳动，其中(3/7)的人打扫礼堂，剩下的队员中(3/8)的人打扫操场，再剩下的(1/4)打扫教室，其余的人负责打扫室外空地，问打扫空地的有多少人？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

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

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/7) * (5/8) * (3/4)</gadget>
<output>15/56 = around 0.267857</output>

<gadget id="calculator">56 * (15/56)</gadget>
<output>15</output>

<result>15</result>