The price of a commodity is reduced by 10 yuan, and the current price is 15 yuan, how much is the price reduced?
一种商品，降价10元，现在售价是15元，降价多少
<gadget id="calculator">10 + 15</gadget>
<output>25</output>

<gadget id="calculator">10 / 25</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>