The school brought a pile of sand, and used it to build the wall (1/5), and repaired the playground and used the rest (5/8). In the end, there were still 6 tons left. How many tons of sand were used in total?
学校运来一堆砂子，砌墙用去(1/5)，修操场又用去剩下部分的(5/8)，结果还剩下6吨，一共用去砂子多少吨．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">6 / (3/8) / (4/5)</gadget>
<output>20</output>

<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<result>14</result>