Rapeseed was topdressed with 0.15% ammonia water. There is 30 kilograms of ammonia water containing 16% ammonia, how many kilograms of water should be added when preparing it?
用含氨0.15%的氨水进行油菜追肥．现有含氨16%的氨水30千克，配置时需加水多少千克？
<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">30 * (4/25)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">0.15 / 100</gadget>
<output>0.0015</output>

<gadget id="calculator">30 * 0.0015</gadget>
<output>0.045</output>

<gadget id="calculator">(24/5) - 0.045</gadget>
<output>4.755</output>

<gadget id="calculator">4.755 / 0.0015</gadget>
<output>3_170</output>

<result>3_170</result>