At the winter sports meeting, the school bought (2/5) tons of lime painting site and used (3/4), how many tons are left?
冬季运动会上，学校买来(2/5)吨石灰画场地，用去(3/4)，还剩下多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) * (1/4)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>