Now there is 45 kg of sugar water containing sugar (1/5), and now it is to be prepared into sugar water containing sugar (1/4), how many kg of sugar should be added?
现在有含糖(1/5)的糖水45千克，现要把它配制成含糖(1/4)的糖水，应加糖多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">45 * (4/5)</gadget>
<output>36</output>

<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">36 / (3/4)</gadget>
<output>48</output>

<gadget id="calculator">48 - 45</gadget>
<output>3</output>

<result>3</result>