liquid medicine, wherein the mass ratio of powder and water is 1:120. The existing medicinal powder is 2.5 kilograms, how many kilograms of water need to be added to prepare this medicinal solution?
一种药水，其中药粉与水的质量比为1：120．现有药粉2.5千克，要配制这种药水需加水多少千克？
<gadget id="calculator">2.5 / 1</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 * 120</gadget>
<output>300</output>

<result>300</result>