20 tons increased by how much is 25 tons.
20吨增加多少后是25吨．
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>