A kind of pesticide, the ratio of medicine to water is 1:200, the existing medicine is 3 kilograms, how many kilograms can be made into medicine.
一种农药，药和水的比是1：200，现有药3千克，可以配成药水多少千克．
<gadget id="calculator">200 / 1</gadget>
<output>200</output>

<gadget id="calculator">1 + 200</gadget>
<output>201</output>

<gadget id="calculator">1 / 201</gadget>
<output>1/201 = around 0.004975</output>

<gadget id="calculator">3 / (1/201)</gadget>
<output>603</output>

<result>603</result>