To dilute 30 kg of saline (3/20) brine into saline (1/20) brine, how much water should be added?
将含盐(3/20)的盐水30千克稀释成含盐(1/20)的盐水，需要加水多少千克？
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(3/20) / (1/20)</gadget>
<output>3</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">90 - 30</gadget>
<output>60</output>

<result>60</result>