A bag of rice eats (3/8) of it, exactly 21kg, how many kg does this bag of rice weigh?
一袋大米吃了它的(3/8)，正好吃了21kg，这袋大米有多少kg．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">21 / (3/8)</gadget>
<output>56</output>

<result>56</result>