A bottle of alcohol, pour out (1/3) for the first time, then pour 40 grams back into the bottle, pour out (5/9) of the alcohol in the bottle for the second time, and pour out 180 grams for the third time, at this time There are 60 grams left in the bottle. How many grams of alcohol were in the original bottle?
一瓶酒精，第一次倒出(1/3)，然后倒回瓶中40克，第二次再倒出瓶中的酒精的(5/9)，第三次倒出180克，这时瓶中还剩下60克．原来瓶中有多少克酒精？
<gadget id="calculator">180 + 60</gadget>
<output>240</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">240 / (4/9)</gadget>
<output>540</output>

<gadget id="calculator">540 - 40</gadget>
<output>500</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">500 / (2/3)</gadget>
<output>750</output>

<result>750</result>