A bucket of water, when 3/4 of it is used up, is exactly 15 kilograms. How many kilograms does this bucket of water weigh?
一桶水，用去它的(3/4)，正好是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">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / (1/4)</gadget>
<output>60</output>

<result>60</result>