A bucket of water, use up its (3/4), use up 15 kg. How many kilograms does this bucket of water weigh?
一桶水，用去它的(3/4)，用去了15千克．这桶水重多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<result>20</result>