A potion for spraying fruit trees, the mass ratio of pesticide to water is 2:75. There are 300 grams of pesticides, how many kilograms of this medicine can be prepared?
一种喷洒果树的药水，农药和水的质量比是2：75．现有300克农药，能配这种药水多少千克？
<gadget id="calculator">2 + 75</gadget>
<output>77</output>

<gadget id="calculator">2 / 77</gadget>
<output>2/77 = around 0.025974</output>

<gadget id="calculator">300 / (2/77) / 1_000</gadget>
<output>231/20 = around 11.55</output>

<result>231/20 = around 11.55</result>