There are 300 grams of sugar water, sugar accounts for 20% of the sugar water; after adding some water, sugar accounts for 12.5% of the sugar water, how many grams of water are added?
有糖水300克，糖占糖水的20%；加了一些水后，糖占糖水的12.5%，加了多少克水？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">(1/5) / 0.125</gadget>
<output>1.6</output>

<gadget id="calculator">300 * 1.6</gadget>
<output>480</output>

<gadget id="calculator">480 - 300</gadget>
<output>180</output>

<result>180</result>