Dilute 1800 grams of 95% alcohol solution into a 75% alcohol solution for disinfection, how many grams of distilled water need to be added?
把浓度为95%的酒精溶液1800克，稀释成浓度为75%消毒用的酒精溶液，需要加蒸馏水多少克？
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(19/20) / (3/4)</gadget>
<output>19/15 = around 1.266667</output>

<gadget id="calculator">1_800 * (19/15)</gadget>
<output>2_280</output>

<gadget id="calculator">2_280 - 1_800</gadget>
<output>480</output>

<result>480</result>