The school brought a pile of sand and used it to build the wall (3/5) and build the runway (3/8). How much of this pile of sand is left?
学校运来一堆沙子，砌墙用去(3/5)，修跑道用去了(3/8)，这堆沙子还剩几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/5) - (3/8)</gadget>
<output>1/40 = around 0.025</output>

<result>1/40 = around 0.025</result>