A kind of disinfectant is made up of medicine powder and water according to the ratio of 1:20. How many kilograms of disinfectant can be made into 15 kilograms of existing medicinal powder?
一种消毒药水是用药粉和水按1：20配制而成的．现有药粉15千克，能配制成多少千克消毒药水？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">15 / (1/20)</gadget>
<output>300</output>

<gadget id="calculator">15 + 300</gadget>
<output>315</output>

<result>315</result>