pile of sand weighs 5 tons. The first time (3/8) of this pile of sand was removed, and the second time (4/15) of this pile of sand was removed. What fraction is left?
一堆沙子重5吨，第一次运走了这堆沙子的(3/8)，第二次运走这堆沙子的(4/15)，还剩几分之几没运走？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 - (3/8) - (4/15)</gadget>
<output>43/120 = around 0.358333</output>

<result>43/120 = around 0.358333</result>