A bottle of beverage has already been drunk (2/5), and there is 270 ml left in the bottle, how many ml has been drunk?
一瓶饮料，已经喝了全部的(2/5)，瓶里还剩270毫升，已经喝了多少毫升？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">270 / (3/5)</gadget>
<output>450</output>

<gadget id="calculator">450 * (2/5)</gadget>
<output>180</output>

<result>180</result>