A barrel of oil uses 24 kilograms, and there is still (1/4) left. How many tons are left in this barrel of oil?
一桶油用去24千克，还剩下(1/4)，这桶油还剩多少吨？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / 1_000</gadget>
<output>3/4_000 = around 0.00075</output>

<gadget id="calculator">24 * (3/4_000)</gadget>
<output>9/500 = around 0.018</output>

<result>9/500 = around 0.018</result>