A bottle of alcohol, pour out (1/3) for the first time, and then pour 40 grams back into the bottle; pour out the remaining alcohol in the bottle for the second time (5/9); pour out 180 grams for the third time, There are 60 grams left, how many grams of alcohol are there in the original bottle?
一瓶酒精，第一次倒出(1/3)，然后倒回瓶中40克；第二次倒出瓶中剩下酒精的(5/9)；第三次倒出180克，瓶中还剩下60克，原来瓶中有酒精多少克？
<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>