50kg bag of rice was brought into the cafeteria and eaten for two weeks. I ate (1/5) of this bag of rice in the first week and 3/5 of this bag of rice in the second week. How many kilograms are left rice?
食堂运进一袋50千克的大米，吃了两周，第一周吃了这袋大米的(1/5)，第二周吃了这袋大米的(3/5)，还剩下多少千克大米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (1/5) - (3/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">50 * (1/5)</gadget>
<output>10</output>

<result>10</result>