Put 5 kg of sugar into water to make sugar water with a sugar content of 25%, how much water is needed
将5千克糖放入水中，制成含糖率为25%的糖水，需要用水多少千克
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 / (1/4)</gadget>
<output>20</output>

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>