kind of insecticide is prepared by mixing liquid medicine and water according to the mass ratio of 1:15. Now we need to add 60 kilograms of water. How many kilograms of this liquid medicine is needed?
一种杀虫剂是由药液与水按1：15的质量比配制而成，现要加水60千克，需要这种药液多少千克？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 60</gadget>
<output>4</output>

<result>4</result>