My mother sent a bag of rice to Grandma Li's house. Their family ate 40% in the first week, 12 kg in the second week, and 6 kg left. How many kilograms did this bag of rice originally weigh? (Solution of column equation)
妈妈给特困户李奶奶家送去一袋米．他们家第一周吃了40%，第二周吃了12千克，还剩6千克．这袋米原来有多少千克？(列方程解)
<gadget id="calculator">6 + 12</gadget>
<output>18</output>

<gadget id="calculator">18 / 0.6</gadget>
<output>30</output>

<result>30</result>