A bag of rice weighs 30kg. I ate (1/5) of it for the first time and (2/5) kg for the second time. How many kg did I eat in total?
一袋大米重30kg，第一次吃了它的(1/5)，第二次吃了(2/5)kg，两次共吃了多少kg．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>