A bag of rice weighs 50 kilograms, and 60% of it is eaten, how many kilograms are left?
一袋大米重50千克，吃了60%，还剩多少千克．
<gadget id="calculator">60 / 100</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">50 * (2/5)</gadget>
<output>20</output>

<result>20</result>