A bag of rice, after eating (2/5) in the first week and (1/5) in the second week, there is still 6 kilograms left. How many kilograms does this bag of rice have?
一袋大米，第一周吃了(2/5)，第二周吃了(1/5)，还剩6千克，这袋大米原有多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">6 / (2/5)</gadget>
<output>15</output>

<result>15</result>