A barrel of kerosene weighs 16 kg, use up (3/4). How many kilograms are used?
一桶煤油重16千克，用去(3/4)．用去多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">16 * (3/4)</gadget>
<output>12</output>

<result>12</result>