A pile of sand, 2.4 kg is used for the first time, and the remaining 25% is used for the second time, leaving 6 kg. How many kg is this pile of sand?
一堆沙子，第一次用去2.4千克，第二次用去余下的25%，还剩6千克，这堆沙子有多少千克？
<gadget id="calculator">25 / 100</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">6 / (3/4)</gadget>
<output>8</output>

<gadget id="calculator">8 + 2.4</gadget>
<output>10.4</output>

<result>10.4</result>