To prepare an insecticide, the mass ratio of potion and water is 2:700. The existing potion is 5 kg, how many kg of water needs to be added.
配制一种杀虫剂，药水和水的质量比是2：700．现有药水5千克，需要加水多少千克．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 700</gadget>
<output>1_750</output>

<result>1_750</result>