There is a bag of rice, I ate (2/5) in the first week, ate 12 kg in the second week, and there are 6 kg left. How many kilograms is this bag of rice?
有一袋米，第一周吃了(2/5)，第二周吃了12千克，还剩6千克．这袋米原有多少千克？
<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">18 / (3/5)</gadget>
<output>30</output>

<result>30</result>