kind of pesticide, the ratio of medicine to water is (1/300), the existing medicine is 5 kilograms, how many kilograms of water should be added.
一种农药，药和水的比值是(1/300)，现有药5千克，要加水多少千克．
<gadget id="calculator">300 / 1</gadget>
<output>300</output>

<gadget id="calculator">5 * 300</gadget>
<output>1_500</output>

<result>1_500</result>