A bag of rice, after eating (3/5), there are still 30 kilograms left, how many kilograms does this bag of rice originally weigh?
一袋大米，吃了它的(3/5)，还剩30千克，这袋大米原来有多少千克．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<result>75</result>