A batch of goods was shipped, (3/8) tons were shipped on the first day, (2/5) tons less than the second day, and (1/4) tons less than the sum of the previous two days on the third day. How many tons were shipped on the third day?
运一批货物，第一天运了(3/8)吨，比第二天少运(2/5)吨，第三天运的比前两天的总和少(1/4)吨．第三天运了多少吨？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(3/8) - (1/4)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(3/8) + (2/5) + (1/8)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>