A bag of rice is 50kg, 35kg is used up, what percentage of the rice is left in the bag?
一袋大米50kg，用去了35kg，剩下的占这袋大米的几分之几？
<gadget id="calculator">50 - 35</gadget>
<output>15</output>

<gadget id="calculator">15 / 50</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>