A bag of potatoes, after eating (2/3), there are 30 kilograms left, how many kilograms are there in this bag of potatoes?
一袋土豆，吃了它的(2/3)，还剩30千克，这袋土豆原有多少千克．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 / (1/3)</gadget>
<output>90</output>

<result>90</result>