A pile of yellow sand weighs 10 tons, 1.26 tons were used for the first time, and 0.4 tons less than twice the amount used for the second time, how many tons is this pile of yellow sand less than the original?
一堆黄沙重10吨，第一次用去1.26吨，第二次用去的比第一次的2倍少0.4吨，这堆黄沙比原来少了多少吨？
<gadget id="calculator">1.26 * 2</gadget>
<output>2.52</output>

<gadget id="calculator">2.52 - 0.4</gadget>
<output>2.12</output>

<gadget id="calculator">2.12 + 1.26</gadget>
<output>3.38</output>

<result>3.38</result>