A kind of pesticide is formulated according to the ratio of liquid medicine and water 3:250, how many kilograms of this pesticide can be prepared with 7.5 kilograms of liquid medicine?
一种农药，按药液和水3：250配制面成，7.5千克药液能配制这种农药多少千克？
<gadget id="calculator">3 + 250</gadget>
<output>253</output>

<gadget id="calculator">3 / 253</gadget>
<output>3/253 = around 0.011858</output>

<gadget id="calculator">7.5 / (3/253)</gadget>
<output>632.5</output>

<result>632.5</result>