A bag of rice is 50 kilograms. I ate (2/5) on the first day and the rest (1/4) on the second day. How many kilograms are left in this bag of rice?
一袋米50千克，第一天吃了(2/5)，第二天吃了剩下的(1/4)，这袋米还剩多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 * (2/5)</gadget>
<output>20</output>

<gadget id="calculator">50 - 20</gadget>
<output>30</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">30 * (3/4)</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>