A pile of sand weighs (7/8) tons. Master Li transported away (3/8) of it on the first day, and (1/4) of it on the second day. How much was not shipped?
一堆沙重(7/8)吨，李师傅第一天运走了它的(3/8)，第二天又运走了它的(1/4)，还剩下这堆沙的几分之几没运走？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">1 - (3/8) - (1/4)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>