A bottle of drink, drink 300 ml, exactly (3/5) of this bottle of drink, how many milliliters of this bottle of drink.
一瓶饮料，喝了300毫升，恰好是这瓶饮料的(3/5)，这瓶饮料共多少毫升．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">300 / (3/5)</gadget>
<output>500</output>

<result>500</result>