A bag of rice, 40% of it was eaten in the first week, and (1/5) was eaten in the second week, leaving 6 kilograms. How many kilograms did this bag of rice originally have?
一袋米，第一周吃了40%，第二周吃了(1/5)，还剩6千克，这袋米原来有多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) + (1/5)</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">6 / (2/5)</gadget>
<output>15</output>

<result>15</result>