After eating (1/3) of a pack of biscuits, there are 180 grams left. How many grams are there in this pack of biscuits? what is the correct formula
一包饼干吃了(1/3)后，还剩180克，这包饼干原来有多少克？正确的算式是多少
<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">180 / (2/3)</gadget>
<output>270</output>

<result>270</result>