There are 126 people on the playground, each with 6 people in a row, and the distance between the two rows before and after is 80 cm. How long are these lines?
操场上有126人，每6人一行，前后两行之间的距离是80厘米．这些队伍前后共多长？
<gadget id="calculator">126 / 6</gadget>
<output>21</output>

<gadget id="calculator">21 - 1</gadget>
<output>20</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 * (4/5)</gadget>
<output>16</output>

<result>16</result>