After the price of a commodity is reduced by 3 yuan, the selling price is 27 yuan. How much is the price of this commodity reduced?
一种商品降价3元后，售价是27元，这种商品降价了多少．
<gadget id="calculator">3 + 27</gadget>
<output>30</output>

<gadget id="calculator">3 / 30</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>