Originally planned to produce 20 tons of iron, but actually produced 23 tons, how much was exceeded.
原计划生产20吨铁，实际上生产了23吨，超产了多少．
<gadget id="calculator">23 - 20</gadget>
<output>3</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>