The cafeteria transports (2/3) tons of coal, uses (1/4) tons, and then uses the remaining (1/3), how many tons are used?
食堂运来(2/3)吨煤，用去(1/4)吨后，又用去余下的(1/3)，又用去多少吨？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/12) * (1/3)</gadget>
<output>5/36 = around 0.138889</output>

<result>5/36 = around 0.138889</result>