There is a bag of rice, 40% of which was eaten in the first week, and 12 kilograms in the second week, leaving 16 kilograms. How many kilograms did this bag of rice originally have?
有一袋大米，第一周吃了40%，第二周吃了12千克，还剩16千克，这袋大米原来有多少千克？
<gadget id="calculator">12 + 16</gadget>
<output>28</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">28 / (2/5)</gadget>
<output>70</output>

<result>70</result>